Actually I found that she has impressive concentration...playing games and explaining such a deep subject at the same time. You can think of it more of showing off her mental capacity. Nevertheless, I grow fond of her channel and don't mind of "shtick"-ism. If you can't concentrate just set to audio mode like podcast (assuming you use libretube or vanced/revanced) or just let the audio run while uou shwitch to another tab (probably have the UB refresh the filters to block the ads). I do patron these days and heavy UB.

So it didn't have any direct relevance?

I can play (some) video games and listen to a podcast/book at the same time but I don't think I could play a game and explain something at the same time. It's actually kind of impressive though she did seem distracted but that might be because I was watching the video - maybe if I just listen to the audio it'll be better.

She explains near the beginning that she's playing The Binding of Isaac as a sort of fidget toy, and that it isn't related to what she's talking about. This does not turn out to be a fake out or anything, it is in fact completely unrelated. She does beat the game though :)

Ah, thanks - I must have missed that. I'll learn how a D-latch works instead.