Do we have any evidence they did that other than the comment you replied to speculating?
Otherwise, that's the best we have.
In terms of a possible explanation for why GitLab would take an action, was it considered whether the (disturbed?) user violated GitLab's Terms of Service? Is the assumption that GitLab didn't just enforce their ToS, but that they're instead more likely to be secretly acquiescing to backroom bullying between companies over specific users?