I think the context that you're missing is that the author of the post is one of the main developers for the Asahi Linux project that is porting Linux to the Apple M1/M2 family of Macs. They're trying to implement for Linux software support for all the Mac hardware capabilities that macOS already supports. Since the speaker safety model is apparently done in software under macOS, an equivalent needs to be reverse engineered and implemented for Linux in order for Linux to be able to use the speaker hardware as effectively as macOS does.

Thank you. Now I understand.

Some people like to run Linux on their Apple hardware because they like the quality of the hardware but don't like Apple's software decisions.

I get that, but I don't get why this is "[a] reason why Mac speakers sound better and louder than most". Because Macs' speakers sound great even in MacOS.

So it's about control, the preference of reigning in Hell to serving in Heaven.