I've tried to join multiple times over different Tor circuits. Each time I've been stopped by the "Give us your phone number" nonsense, but each time it has shown me the channel name and details, how many people are online, etc. I'm not familiar with Discord, but it seems like I actually join the channel and then am immediately asked to verify? That would perhaps explain my name showing up in the room.
I haven't ever yet got past the verification page, so if that's not the case, then yes, someone is impersonating me. Thanks for the heads up.
If you make an account over the clearnet I don't think it will demand a phone number from you unless you try to join server where everyone's required to have one. At least that's how I made mine.
Then you can login to discord over Tor without giving phone number details but you'll need to confirm your email each time your IP address changes.
(Also if you see my nickname in the server, it's an imposter, since I won't be joining this server and go by a completely different nickname you can find on my site.)