Lemons do happen with Apple Silicon.

I had a Mac Studio that would kernel panic on a semi-weekly basis. Apple Care put me through the reinstall OS / remove all external devices tap-dance for weeks, insisting that hardware was the last thing to suspect - before Apple Silicon, kernel panics were almost always hardware, particularly RAM.

Ultimately I bought another Studio and swapped it in - kernel panics went away. With that evidence, Apple acknowledged the problem and exchanged my Studio for another one from the factory. I returned the swap unit within the 30 day window, so it didn't cost me anything but annoyance.

Needing to shell out... what? 2000 bucks to prove Apple Support they were wrong seems a very, very bad sign for that Support. Even if you got them back.