This is another vague criticism mixed with some general platitudes. The platitudes are totally irrelevant in the context of people criticizing KA approach.

First, if someone is not motivated, be they adults or children they will not learn, especially in a medium like the internet where there is a lot more freedom in when and what to watch and practise. This has nothing to do with KA.

Second, good teaching can never be assumed just because it's done in a classroom setting. The major problem in education is getting good teachers. There is no system in any country where teachers are continuously evaluated and rewarded ( and get fired ) solely on the basis of performance. That is a big mistake. On the internet, real market forces work. ie people watch whichever course they want to watch. That's where KA shines through. He never forced a single kid to watch his short videos. But his viewership is now in the millions.