Not that I was aware of, I wouldn't doubt it if the dealership did it though.
I have not had it serviced anywhere but the dealership. Started doing fluid changes myself once I saw how terrible the dealership is. It's also the only dealership for 3 and a half hours. But I never even thought of it being something they applied. So does the swaybar mount have any sort of fluid inside?
This could have been done by dealership. Last service I had done was brake pads and brake fluid. It's possible they had a TSB for some issue with the swaybar mount squeaking so they preemptively greased it.