Mechanic says engine mount is worn after catalytic converter stolen

Hello everyone, long story short my catalytic converter was stolen for the second time and I had it replaced at an auto shop through insurance.

When I brought it home, I noticed the car was squeaking when accelerating or decelerating and it could be reproduced by rocking the car. I brought it back to the auto body shop who said it was due to a worn engine mount on the right side (see pictures), and showed me how it leads to the noise when rocking the car. They said it isn’t related to the catalytic converter so I would be on my own replacing it, even though it is located very close to the cat.

From my understanding it would be rare for a gen 3 Prius to have a worn motor mount given the size and lack of power of the engine. It also appears to me that a nut is missing from the right side which I feel like could have been taken off in mistake when the punks took off my catalytic converter. Do y’all think the engine mount failure could be from normal wear and tear or am I crazy in thinking this was from the vandalism and should try getting my insurance to fix the mount? My 2015 Prius has 95k miles on it.