As usual, the differences we talk about.
I agree, even if this video was shot prior to improvements, the core problems some of us have been raising remain. That congested, raspy nature of the tone as compared to the real amp. There's also seems to be some strange hair/fizz on the top end (that may all be part of the rasp effect, who knows)
I can tolerate the congested aspect more than the gain "texture" issue since to me this is what makes the KPA sound less real than it otherwise would. I usually find myself have to play around with post EQ to try and correct these issues to an extent.