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Just came across this new user after their name popped up in the review queue. Someone already made a point to them about their user name on this answer, but what actually happens in this situation?
As with most issues, just flag it for moderator attention, and/or, if you feel comfortable, leave a comment on their post asking them to change it.
Mods can and will reset the username to a default (UserXXXXX or whatever).