@nprofile1q... @nprofile1q... It's incorrect terminology and shouldn't be used to refer to GrapheneOS. It propagates misconceptions and misunderstandings. It's an operating systems, not read-only memory firmware.
GrapheneOS is not solely a replacement for a stock OS on a device can be the stock OS itself. It isn't inherently an aftermarket OS.
This has nothing to do with x86 vs. ARM and that doesn't match the way you're using the term in this thread or elsewhere regardless.