Wave 10 - Regents Flagship - Garak

When Elim Garak is assigned to a Mirror Universe ship, add 2 to that ship's Captain's Skill Number
When is the skill bonus applied? Is it conditional on Garak being enabled and still on that ship? I would think he functions as a normal upgrade where if he gets disabled the Captain Skill bonus no longer applies or if he moves off the MU ship, the bonus also no longer applies.