This isn't an April Fool's: The Ryubing GitLab is being retired in favor of a customized Forgejo instance.
You can view the instance here.
This GitLab instance will still be accessible & running for a time on legacy.git.ryujinx.app; to allow everyone to migrate what they need to.
That being said, it is eventually going offline; and will replace this domain. You should take the time this instance has left to backup/migrate whatever you wish from it.
Don't bother with the project archive or mirrors; we handled that already.
The Update Server has already had changes to accomodate this migration. When the time comes, it'll hopefully be like we were always on Forgejo to the average user.