Looks like run of the mill corrosion. We see a good deal of it here on trucks that are not wrapped. Even the stainless trim corrodes down here at sea level. Unwrapped hardware on the truck looks like it is well used.
It is pretty hard to cut through the powder coat/baked finish during install, unless you had a very heavy-handed installer.
If that was the case there would be a lot more damage at most of the trim edges.
Tell him it might be Covid and see if he can claim it with the feds.