This is complete nonsense. I have three of these barreled actions that are factory cerakoted. I asked Mt Tactical what actual field use issues this causes with zero response so far.
All three of mine have thousands of rounds shot using Maven RS1.2s and SWFA scopes in UM Tikka rings. All 3 have been shot out past 1,000 yards many times with hits on 10”, 12” and 16” gongs. None of them have ever been re-zeroed.
Mine did have a little bit of cerakote in the plug holes. So I took at 1/6th” drill bit and 3 seconds and the UM threaded pins went right in with zero issues. I’ve had to do the same thing on those holes with regular stainless actions as well.
Tikkas response from Finland is spot on. This will not cause issues with anything other than maybe some screws not going in. It literally takes seconds to resolve the issue and happens on non cerakoted actions as well.