You are partially correct. The pacing is a thing, for sure.
But if you do watch those videos there are plenty of non-joke pauses for laughs. I can recall one where one of the guys walks up to the others sitting in the cafeteria and says “hey guys”… pause for laughs. He wasn’t dressed funny, he wasn’t doing anything odd, just… “time to laugh, I guess”.
IMO, canned laughs are the tool of those that aren’t really that good at writing comedy.