While I will agree that maybe Sir Christopher is possibly stretching the truth regarding CGI (it's entirely possible there isn't one entire, totally computer-generated shot), but computer-aided, computer-enhanced, no. Especially in this day and age, everything is touched by Inferno/Flame/Smoke/Nuke/AE/Blender/Maya/blah blah blah.
When you say "matte painting" you mean traditional, non-digital, paint-on-glass? Forgive my ignorance, but why would that be any more or less noticible in IMAX?
🙄 While I'd agree with you if I didn't doubt you about credited pets and kids without actual roles, I'm pretty certain nobody has a problem with the memorial title cards.