I was just about to say that xD.
Seriously, though, I don't think this is them. There have been a lot of people pretending to be others currently, so it wouldn't be too far-fetched.
And also what they said doesnt make much sense. You shared your display name? Okay, but that isn't your username, and even with your username, hackers couldn't really get your account. Unless you just gave away your password and username, they can't really hack you.
- Dino (he/they)