The official answer seems to be: CIG trying to get as many people to the Manchester office and he may or may not be unwilling to relocate. That’s just my guess though.
GamesIndustry has additional comment from CIG on the matter.
For what it’s worth, he’s been replaced by Richard Tyrer (director of Squadron 42).
Not a bad episode but I find it really funny how Nate talked about Idris being “packed” - it’s a space ship and a military one at that, shouldn’t “packed” be the goal here?!