I understand the sentiment, but it’s not really a matter of believing they are there or not...unless everything referencing the sensors in the owner’s manual, install manual for the performance brakes, and your own build sheet is a lie?
They have a specific RPO code (JBP). The RPO is shared with the only other GM car that is documented to use sensors in the pad, the CT6. On that car there are sensors in the front left pads and right rear pads. I have no reason to believe this system is any different, beyond just speculation due to the massive inaccuracies some are experiencing.
GM probably doesn’t even know why this is happening yet, but mine are accurate so I personally have no reason to question my dealer or GM on it. If I had the numbers some of you have I would definitely be up their ass to get some sort of answers. It’s not a big deal but it’s a “feature” that I would expect to work somewhat accurately or why would they spend the money on it?