Of course we disagree - media relations is about narrative, which of course the journalists control more than the speaker
So in this interview, he seeks no information but rather seeks to defend himself
But then what is the point of the interview in terms of the case?
This is precisely what I warned about - the media focus has become about HCW and no longer about seeking information
Why does HCW need to appeal for information to make an interview worthwhile? He's already said what they are looking for several times and it hasn't changed. It's not necessary that he has to keep repeating it every time he's asked for another interview. And as I pointed out, you/we don't know that he didn't anyway, none of us has seen the full interview. We only know those 2 excerpts the BBC decided were worthy to include in the news article (and note they didn't bother to show the context of what they were being answered in relation to).
There's a strategy called the 5 why's that is used in industry to determine the real route cause(s) or reason for a given issue. It's usually used as an interrogative strategy for Quality or Health and Safety failures but it can usually be applied to most conundrums by asking 'why?' 5 times to each given response.
Applying it to your question, I would answer as follows.
Q. If he is not seeking information, what is the point of doing the interview.
A. Because the BBC requested it. Why?
A. Because there is a massive media interest in this suspect. Why?
A. Because it is one of the biggest mysteries of the last 20 years and a highly respected and credible Prosecutor (HCW) has said in no uncertain terms CB killed MM and they have secret evidence to prove it. Why?
A. Because HCW wanted everyone to take the claim seriously and generate a huge media storm. Why?
A. Exposure, the more people the news reaches, the likelier they are to recieve new evidence to help their case.
For me, his strategy is as simple as that. You could equally answer the same 5 why's from the aspect of why HCW agreed to the interview, and IMO it would come back the the same root reason. Keeping these interviews going where he releases tiny news-worthy quotes, without actually giving anything new away, enhances the public interest and keeps the appeal alive.