Then he said Arch Linux should implement it anyway because the law requires it. archinstall PR #4290

Well, it's not "the law", it's your local law. To most people on the planet, it doesn't apply any more than for example North Korea's laws. As far as I can find, Arch Linux is not owned by a foundation or similar legal entity (i.e. which could have been located in California), but the lead developer appears to live in Germany.