For those who didn't see @JuliusBorisov's response on typo_tilly's wall: Warnings aren't publicly posted on profiles these days. They're confidential now; only moderators can view those warnings. The idea is to protect the privacy of warned users.
Once a user commits enough offenses to get banned, it's not really possible to keep their rulebreaking behavior confidential anymore. The banishment is invariably public, and often other users want to know why. Instead of posting a list of indictments (which would be punitive and come off as gossipy) or refusing to explain bans at all (which wouldn't be transparent) we take a middle ground approach and just explain things briefly.
We'd prefer not to call attention to this at all, but when users publicly ask us what happened, we can't just refuse to respond.