I'll join in here. My 2019 RST has about 44k miles on it and I have experienced the brake squealing noise for as long as I can remember. It seems to come from the rear passenger side, and a loud squeal when slowing down at slow speeds and when coming to a stop (backing up or going forward). I thankfully don't have the squeal while driving problem that some note here.
Anyway, I too went to the dealer and complained all through my warranty. They gave me the same lines..."its the new brake pad material", "we didn't hear anything" "we couldn't replicate it," and that "all brakes squeal at some point in time. Complete lies and BS, the same response I get when I complain about other things too. I complained until my 36k warranty went out and well, I guess its now my problem.
If a new set a pads will fix it, I will put on the new pads...just let me know which ones. I'll check out the Power Stop. I assume I don't have to turn the rotors, just expand the calipers and put on new pads...even at 44k?