I don't know either, but I do know the gouge wasn't checked on by an astronaut EVA because it could have caused more damage. If I understood right, the tiles are that soft/britle.
NASA engineers thought about whether it was worth the risk of going out to fix it for a while, so it's not likely they haven't tought of such a nearly related scenario (taking advantage of an opportunity to practice repairs vs. whether an inspection EVA is worth the risk).