This is what the Attorney General said in his final report on the McCann's -
b) The archiving of the Process concerning Arguidos Gerald Patrick McCann and Kate Marie Healy, because there are no indications of the practise of any crime under the dispositions of article 277 number 1 of the Penal Process Code. Article 277 number 3 of the Penal Process Code is to be fulfilled. Under article 214 number 1 item a) of the Penal Process Code, the coercion measures that have been imposed on the Arguidos are declared extinct.
Listening to what Mark Rowley had to say in the video that davel posted at the beginning of this thread, he says the Portuguese dealt with the case and he has no intention of starting rumours that it is a line of inquiry by them. Which means 'no they are not investigating the McCann's' in my way of thinking. He goes on to say the McCann's are the parents of a missing child.
So in my opinion anyone thinking they haven't ruled the parents out are delusional.