No, I guarantee it’s nothing to do with that. Something (either an algorithm or a human) must’ve flagged some previous activity of yours as spam. Perhaps erroneously! But now that you’re branded “a spammer” in their system, you’re in spammer-jail unless someone overrides that report.
You could create a new account with a different email address, I suppose, but that seems like overkill. I’d try to get it cleared up with your current account, first. Not sure how you’d go about contacting GNOME GitLab admins, though, since you obviously can’t open an issue about this… was hoping this would get noticed by or referred to someone with admin rights, but doesn’t seem that way.