Gamebreaking new hack that can soft ban?

So I was watching a streamer the other night when a viewer said in chat “Your game will crash in a minute.” And then a few seconds later, his game froze and closed. When he entered the server again, the same thing happened… he crashed to desktop. This happened on all servers he tried to join. He even tried validating his files and reinstalling the game… nothing worked. Later, the hacker said “sorry I’ll unban you” and his game returned to normal… this needs to be fixed soon.

Btw here’s a meme featuring the hack -