No they haven't, at least not recently (still unclear whether he was questioned in 2013 or not). Possibly he just means that they plan to use it to their advantage against him when they have enough other evidence. The rest of the transcript is here if you are interested:
Studio - Asks about information/insight public prosecutor has
Yes he is, and that insight that he has points in the direction that they have an idea of how Maddie McCann died, of how she died, how the killing was actually done but they do not know and that is something they frankly admit, and it doesn’t seem like tactic,seems to be the truth.
They do not know where the body for example may have been buried.
What they are pursuing now is different people that were close to Christian Brueckner especially in his Portugal years, and one woman of German decent turned up who was running a, ironically a foster home there in Portugal where Christian Brueckner had access to it, and they’re trying to track down that woman but also a former girlfriend who was under age when she lived in, with Christian Brueckner both here in Germany but also in Portugal where he took her and then she was then deported back to there.
We have talked to that family they’re saying that she’s in hiding, Christian Brueckner’s former girlfriend is in hiding, and is protected by her brothers it’s a large family. Doesn’t even want to talk to authorities. So it seems you know they have these pieces of information to verify anything a possible witness may say. But so far they are still lacking that witness.
Piers Morgan then states that he has been following this case very very closely for 15/16 years? He thinks Germans have got their guy.
The GMB reporter then agrees with Piers Morgan.
Reporter continues:
I think the real problem we had initially with the investigation was back to those early days when we were on the scene just days after Madeleine’s disappearance is that there was no forensic taken at all from the apartment, and the law was apparently at the time that you are not considered a missing person until after 48 hours which is absolutely ludicrous when you think of those golden hours when someone first disappears to try and find them. So, the police turned up reluctantly a few days later and carried out some small investigation. So, all of that crucial investigation if there was an accomplice with this suspect they would have left some DNA, some science, some cigarette butts around the apartment if they were watching the apartment for example but none of that was taken
So here we are thirteen years later it is incredibly difficult for the Metropolitan Police, for the German police now who are involved with this investigation and scrambling around trying to find a crucial piece a key piece of the jigsaw puzzle to try to unlock what happened to Madeleine.
But in terms in terms of all the people I’ve been speaking to the contacts back then in light of this new information this certainly is very very significant. They have said categorically that they believe that Madeleine is no longer alive. They haven’t said what evidence they do or don’t have. But clearly they are being very open now trying to force the suspects hand if you like, trying to maybe get him to reveal in prison, although we understand they haven’t actually spoken to the suspect Christian Brueckner yet. He has not shown any indication yet that he wants to take part or help with this investigation.
So, at the minute it really is up to a new piece of information coming forward from the public and from holiday makers in Praia da Luz at that time.
This is what strikes me you’d think that after so many investigations and appeals that all of that would have been exhausted but clearly not. So maybe a photograph or something someone saw at that time that may just help.
Studio:
Someone at hotel may have unwittingly given away that McCann kids on their own as it was written in the staff message book? Is that verifief that this has led to the suspect knowing kids were on their own?
German reporter:
Well that is one of the very tragic details in this investigation because from everything we can see the parents wanted to take the best possible care of their children ad that is what may have led or help lead to this.
We know that this detail is part of the investigation. We know that this is in the German Police Files so to say. So, it is on record, it is being investigated officially. If that is really what tipped…possibly Christian Brueckner off, and to this point you know, German investigators are very certain they have the right guy, but if that was the detail that tipped him off, that is not absolutely clear yet, it is one of the details they are looking at it is on record, but it’s not clear that…it’s not even clear so far from what we understand from German investigators that he was actually going, that Christian Brueckner, if it was him, was actually going after a child when breaking to that apartment.
He had a long record of hotel break ins, and you know that apartment was kind of an easy target it was a basement, an open basement window basically so you know it could have been the investigators are not sure because they have not questioned Christian Brueckner about this so far if this started as a break in or if he was a predator going after a child.