I think removing someone’s maintainer status does communicate disappointment in their performance quite well.
And as for anger and frustration, these things really don’t matter in this circumstance. Work is not therapy. If you need to vent anger and frustration, get a therapist. Employees are employed to do their job, not to be the emotional punching bag for a manager who can’t control their temper.
If an employee doesn’t perform to expectations repeatedly and even after you had a few constructive one-on-ones, then demote them or fire them. No need to vent your anger on them and lose your professionalism.
Tbh, the first time a boss of mine loses their temper and verbally attacks a colleague like Linus did here, they have also lost all of my respect for them. And at that moment I will start to look for another job.