You can still track users without accounts. It's called finger printing. It's still probably associated with the main Google account too. There's tons of articles on Facebook and "dark" accounts.

These bans affect the YouTube Brand account / Channel only, Google accounts haven't been affected by regular YT ToS violations for a while.

Right, he still has access to his Google account, but he can't use YouTube from that account. In fact, he can't create a new account and login to YouTube from any of his devices. His only access to YouTube at this point seems to be through non-logged in access.

Yes, it is. I am not going to create new accounts, it is fundamentally important for me to reinstate my own account.

You mean that he can’t open YouTube at all, not even to watch videos?!

>Now their automated system keeps banning every YouTube account he creates within days of creation.