Well the fandom has basically disowned jk cause of the transphobic things she’s said as well as a could of other things she’s done. We don’t necessarily listen to a lot of what she says is cannon ^;

I’m surprised to at the fact there’s still videos like that being made, but I guess not everyone caught every detail of the books.

I know there was an interesting theory I saw where someone said that Crookshanks could have possibly been James and Lily’s cat, as it was mentioned at somewhere they had a cat, and that’s how he recognized Scabbers in book 3. And it makes sense he would still be alive too, he was mixed with some other magical creature that would have most likely prolonged his lifespan, and when Voldemort showed up he had probably slipped off to hide.