I am not distrusting the OP here, BUT there has been a lot of confusion not clarified by GM about these repairs. Even the dealer techs are lost half the time. I have a 2020 myself and have not seen or read about a 2020 getting a battery replacement yet. Instead, what we 2020+ owners get currently is software to make the battery only possible to use 80% of its capacity (so now an EPA ~207 mile range), but this software update allows the owner to resume normal life of parking wherever and charging wherever.
OP, did you truly get the battery REPLACEMENT!? Or just the software update?
I’d provide the service paperwork to the interested party to prove which it was when the time comes. If you got a battery already, congrats! That’s huge!