If there existed any possibility of an influence of the entertainment system over the controls of that model of plane, an EAD would have been published by now. EADs are public: http://www.faa.gov/aircraft/air_cert/continued_operation/ad/... . Where is the EAD that signals what would be a design failure of the highest level and grounds that model of aircraft until the design has been revised?

If it was not extremely obvious that such an influence cannot exist with the law of physics that we understand, an investigation would be ongoing. The word “investigation” does not appear in the WIRED article, and “investigators” in the Telegraph article only refers to FBI.

The FBI is not qualified to tell whether an aircraft is so obviously immune to the defects that Roberts claim to have exploited that the investigation is an open-and-shut case. They don't like it when people plug into things they aren't supposed to plug into, and this is what they are accusing him of.