If the reply was along the lines of "This is a new firmware check to curb fraud related to undisclosed aftermarket RAM upgrades with potentially unreliable chips." - I'd be fine with it, but basically just coming out to gaslight the user about the issue leaves a very sour taste in my mouth. In the end, they had to come clean anyway, big surprise.
I say this as someone who has been loving Pis despite their price for the straightforward and reliable long-term software support. Not gonna pretent like I'll never buy a Pi again, but it's another strike moving me to explore other options in the future.
I do feel for them; they're between a rock and a hard place with mis-labeled clone boards. But their implementation seems to be the most hostile and opaque possible way to achieve these goals (which I also understand from an anti-cloning standpoint, but especially anymore, it's going to get reversed anyway).
It's pretty normal for the first port of call / warranty claim for a busted item to be the dealer that sold it to you.