Do the demigods of the Linux kernel - Linus and the core maintainers - personally want the kind of code Asahi is developing to be merged into the kernel? The author writes as if part of his drive was that Linus himself showed enthusiasm for getting Linux on Apple Silicon.
If there is interest in the work Asahi has done, then the Linux team needs to describe what they see as the gap between today's code quality and support model and what they want to see before upstreaming.
It sounds like the Linux team has been wishy-washy and needs to draw a line in the sand on their needs rather than handwaving about being part of the "community".
It would be fair to say "we don't like your attitude or trust you to work with us kindly over the years and don't want to deal with you", if that's the case. Just don't dance around it.