It’s always said that A&H read everything here, but they like tend to steer clear of questions that only they could answer.
Perhaps it’s more entertaining for them to just read along here. 
Keith once commented on this with the SQ, but based on many similarities, the lack of MP3 playback and the lack of a system clock (not audio clock), I’m simply assuming that also CQ and QU 2.0 don’t use any known operating systems.