Tom's Hardware claimed a bit ago that EAC was getting support for ARM on Windows, Linux, and Switch 2, but if you read the release notes linked in that article you will find that Windows on ARM is supported but ARM Linux is not. In fact, the Epic Games developer site explicitly states that ARM Linux is not supported.
But who does this actually affect?
Well, it affects Asahi Linux users. Technically it affects Crossover users too, but I don't pay attention to macOS gaming these days. Asahi users like myself used to run Rocket League via Legendary and WINE with FEX dlls, much the same way Proton 11 now supports ARM Linux. With EAC, that is no longer possible. The main reason Epic Games should care, though, is because of the upcoming Steam Frame. The Steam Frame will use Proton 11 to play Windows x86 games on ARM Linux, but without Easy Anti-Cheat support for ARM Linux the Steam Frame will not be able to play Rocket League.