I would be calm about what Wolfheart says, from what I heard the guy has tendency to REALLY fanboy over this game and ban people for commenting anything critical about it (although I have not seen proof of that, but the way this guy talks about BG3 makes it... not that out of place). If there are 2000 npcs then I think it is in entire game. If it was just the city I feel like it would be very visible on screen. 2000 Npcs in the entire game and around half of them being interactable... again, in the entire game, that seems more reasonable and realistic.
I have no affiliation with the channel but my general stance is that of avoiding spreading that sort of rumours about someone.
Even if it were true, managing a forum or a Youtube channel isn't easy and sometimes actions are required. Did you hear it first hand from someone who was banned? Did that person explained exactly how it happened? I've already seen comments of people correcting him and he was taking that honestly and with humour. That's only what I've observed though.
Be that as it may, it has no relationship with the content. I'm not watching every video, but those I've watched were accurate.
Besides, as we said, the actual number doesn't matter as much as the order of magnitude. If you watch the video, you'll hear him say that he thinks it's 2000 but he isn't sure whether it's just in the city or in the whole world. I think that anyone would already be more than happy with the latter.