Mentions and quotes get anonymized, for example here’s a user we anonymized on Meta:
So the biggest thing to look out for is identifying content in plain text or images. If you’re going to request your account to be anonymized, you might want to do some searching on the forum to see if any personal information was shared that you’d like to remove. Maybe someone mentioned your username without the @ or quoted some identifying content manually with >… even in the case of an account deletion this may be an issue, because it’s content posted by others.