Not true. I am not going to go on the record and say I'm the world's best tuner or anything, but I have been tuning cars a very long time. Sure, you can clear it. You can swap modules, but that P1400 always comes back. Always. Even if you swap everything, the P1400 comes back every time Dodge does an OTA update to the system. As I mentioned, that P1400 gets replicated across the entire system and is repeated on individual modules. If the system is ever cleared of the P1400, it just gets rewritten. So, while someone may think they cleared the P1400, it will return. Even if you somehow clear out every instance of it in the system, so long as the car has a functional cell radio module, it will just pop back up in an hour or two.
Even if you disable the phone module, you'll just end up with a perma pop-up that covers the center cluster MFD that says something like, "Repair/Replace phone module - code (something)". I tried that myself a while back. So yes, you can defeat the P1400 by disabling the internal comm connection (by removing it), but then you're left with a popup that kind of ruins the dash display until it's repaired.
Ford uses a very similar system on the Coyote's PCM. Only the Coyote doesn't give any indication by way of a trouble code that it's been tampered with. Instead, it flashes the diagnostic file to Ford's home servers every time you turn on the car. Thus, the tune being present is ever-persistent in their database, which is also usually not available to the dealer. In this case, you can hoodwink the dealer by failing over to the stock tune, but if you ever file a warranty claim on the powertrain, the department that does warranty approvals on Ford's end knows right away if the car has been tuned or not.
Ford's anti-tampering system is read only. They receive info and store it. Dodge's is a two-way system. They receive the vehicle's data and also push config files back. Thus, you can do an entire engine, trans, and electronics swap and start with a clean slate, only to get the P1400 right back as soon as the cell radio connects to Dodge's servers.