I have no experience with that channel. What makes you think it is being brigaded? Seems like a very unusual target. Given that it’s well-used tracks that appear to be affected, it seems to me that it may just be attracting a greater breadth of viewers - who are generally less familiar with the content and may have different expectations (and would be just as likely to downvote whether visible or not.)
It’s the one labelled ‘caps-lock’. Probably needs a key combo to actually toggle caps-lock.
Similarly the left ‘shift’ is also the ‘a’ key. I would guess tap for ‘a’, hold for ‘shift’.