Perhaps Illien knows more about their overall R&D and its application at Mercedes F1 over the past few years than we really understand. Perhaps he was actually involved in some of R&D. Doesn't Daimler have an ownership investment in Ilmor? As Mercedes-Benz High Performance Engines Ltd?turbof1 wrote: ... but Red Bull could do it 1 if they attract the necessary people and knowhow. Illien/Ilmor would not suffice I think given their emphasis on the ICE, but they could attract some employees or even ex employees from the competition. If the necessary know how is there, then they could at least have something to put in the car....
Perhaps that's why RedBull hired Illien in the first place?
RB have probably have had their own PU in mind for a number of years. If not for performance reasons, then at least to protect themselves from becoming merely another non-works team when Renault decided to jump back in.
Perhaps Renault had a contractual obligation to notify RB (their "works team") when or if they returned to F1 as a works team, thus relegating RB to a PU supplied team. Perhaps Renault has been "saving" their development budget for the Renault works team. And that is what started the war of words.
Conjecture, of course.