They don't need to but is easier than the method you are proposing. 11The funniest thing is devs don't even need to add anti-cheat measures or a permaban to defeat ErTuG_.
When a player matches with an account used by ErTuG_ on the matchmaking thing (list must be updated very regularly), just add a prompt in the lines of:
One of the players you have been matched with has a high probability of using cheats. Do you want to join this match anyway?
(YES) ____________ (NO, RESUME QUEUE)
97% of the players will click no, and soon enough ErTuG_ will get 2 hours queues to get matched with 11xx players.