Here is the message where he found out what happened:

I didn't receive any information about it but when creating a support ticket I was told my account has been flagged and I had to do some extra verification. I've created a support ticket now and will keep you posted. I'll believe it's nothing major though, I use 2FA everywhere, the last commit on all repos is what I expect, and all sessions and usages look fine

Absolutely fuck Github and Microslop, they can just vanish your projects without notice whenever they want with barely any justification for it, and then take their sweet time to fix it too.