My guess is that it’s just more wild speculation that will ultimately be damning for the Portuguese authorities and the Portuguese tourism industry. The BEST possible outcome of all this for the Portuguese police is that they prove they’re right about the McCanns killing their daughter and disposing of her body nearly a month after the fact. Then they have to admit that during what they advertised to the public as an intensive investigative operation to find Madeleine dead or alive, the McCanns were able to conceal the body for nearly a month, retrieve it, put it in their rental car, drive it off somewhere, and bury it, all without being detected by the Portuguese “investigators”.
The Portuguese authorities cannot be blamed in retrospect for having believed the McCanns and for having kept the McCanns closely informed of their movements.
If the investigators are telling you where they are looking for the body, then you have a much better chance of concealing it from them.
The most unprofessional thing the police have done in this case has been to trust the McCanns and given them access to the investigation. If it were the FBI, the McCanns would have immediately been considered persons of interest and they would have been grilled relentlessly from the beginning.