I think only you can delete the anonymous account by logging into it and do a delete account... if you linked it with an email address.
If there is no issue of "Email already in use" for you with the Jorg account then I suppose it's fine to forget about it.
From my side, I can kick the anonymous user from the server, but that won't delete the account from Discord's main global database (that is if it did get properly registered and is not something temporarily craeted with a auto delete timelimit).