My interpretation is that some people here don't like that the sister who this information comes from didn't go to LE with it until 2-3 weeks later, which has been explained by the D as her not knowing about the murder until then, but to a lot of people it simply coincides with the first announcement of a reward. She's suspect to people here because she was given a polygraph, even though the D is saying she did this basically because she wasn't being listened to.
Since it's been suggested that the sisters were just out to get the reward money by throwing their brother under the bus, it apparently makes the sisters' statements void. They must have told their brother, "Oh, and if you are ever given a DNA test, tell them you spit on one of the girls!" It doesn't seem like a very logical plan to me, but so be it. It's just my opinion, after all.
It's not even considered by many a possibility that the sisters are telling the truth, because EF isn't behind bars thanks to DNA evidence. Just because he said he spit on one of them doesn't tell the whole story, IMO. To me, the fact that LE has DNA tested KAK, TK, TK's dog, EF, and likely a multitude of others suggests that there is something from the CS to compare, although we don't really know. But the D says JH testified that there isn't RA DNA evidence, either. What do we do with that?
I just don't get the concept that the D is straight up lying in this memo. Their tactics might totally suck, but if they were lying without any supportive evidence to back it up, I'd be worried eventually it would be deemed that RA did not receive competent counsel. I don't want to see that happen, either, if he's guilty. JMO.