The PJ was quoted in one of the news sources (think it was from yesterday's news), as stating that a particularly detailed account of the DNA, complete with % reliability, was absolutely false.
Given that, the McCanns have repeatedly indicated that they are not able to discuss the case/questions they have been asked, do to the legal restrictions imposed by law - I found it curious, but fascinating, that so much information has been reported in the news.
So I am left with the impression, that one of two things is happening:
1. The JP has watched helplessly, as case info was leaked to the press. They don't know how to stop the leak; so the best they can do, is quash the info by creating doubt about the reliability of it.
Seriously, it is not too difficult for an investigative reporter to follow behind the JP, and question the very people that were questioned by the JP. E.g., the wait staff at the Tappas Bar, hotel staff, securing room info and room layouts from staff. There are plenty of opportunities for case information to be intercepted. And yes, there will be some inaccuracies in the information reported. But a lot of it is pretty accurate. I'm guessing about 80% accuracy.
or...
2. Much of the case details that we have read, and upon which we are basing our various theories and speculation, is more of the same. Theories posed by news sources, who maybe have some public information - yet speculate on the rest.
For now, I put my money on scenario #1.