Interestingly on of the accounts that the GitHub account who introduced the backdoor follows was suspended very recently [1] who is also part of the org who runs XZ
That JiaT75 account is also suspended, if you check https://github.com/Larhzu?tab=following you'll see that they're suspended as well. It's pretty weird that it's that hard to find out whether a user is suspended.
[1] https://github.com/JiaT75?tab=following