The IP address is blacklisted and off the charts for being high risk proxy i.e. 99 out of 100 threat score. Putting their IP address through stopforumspam.com and cleantalk.org has multiple attack reports.
It would not be the same situation, as this is the automated spam protection system of the forum software blocking them before anything has been posted.
They can register through Discord though, as that is other registration option we have on the forum.