While I don't have Apple hardware so haven't been closely following Asahi I dont't think that is true. Linux has supported Arm for years (more like decades) now. They've been doing excellent work on support for Apple specific hardware sure, generic Arm not so much since it was mostly done.
Maintainers of other non-x86 architecture have said that this is improving things for them[1].
[0]: https://github.com/AsahiLinux/docs/wiki/Broken-Software [1]: https://www.talospace.com/2022/03/asahi-linux-gives-hope-for...