New changes on Gitlab
I haven't deleted a git repo on Gitlab for some time, so I didn't know about a "feature" Gitlab created.
Now on the public Gitlab.com instance, if you try to remove/delete a repo, it defaults into an archived form for 7 days before it's removed.
Here's the Gitlab issue about this:
gitlab-org/gitlab/issues/32935
Also if you try to delete a fork of a repo, it also goes into read-only mode for 7 days as per this issue.
Other relevant issues
Gitlab/Immediately remove a soft-deleted project
Github,TF/Gitlab introduced soft delete of projects and groups