But when checking the video without logging in to YouTube, my comment was gone.
So it looks like comments can be quietly deleted without the commenter even knowing it.
THAT is censorship.
They don't want to deal with criticism and likely consider everything a sunk cost, so it is what it is and nothing will change.
I would disable them as well, not because of 'being afraid of anything' but because it's a net loss to have them enabled, and nothing of value is lost if they are disabled.
Though, after any ordinary live stream has ended the chats usually are retained as chat history or comments if you will.
Title should read "Microsoft disables comments under heavily criticized Windows 11 upgrade video"
Clickbait.