For every FOSS project, it is up to the maintainers to decide the scope of what the project supports. Asahi Linux maintainers have every right to drop support for X11 when it increases the development burden and, according to the post, has lower performance than Wayland on the supported hardware.
Anyone who absolutely needs to stay on X11 due to a use case not yet available on Wayland-compatible software, your options are to switch to a different distro, fork Asahi Linux, or wait for that use case to be supported on Wayland-compatible software.
Based on the decisions mainstream Linux distros and desktop environments have been making, it's clear that Wayland adoption is increasing while X11 is gradually being deprecated. By the time Asahi Linux hits stable, supporting only Wayland will become an even more obvious choice than it is today. The words "don't come to us asking for help" may sound harsh, but they clearly communicate that X11 will no longer be supported on Asahi Linux.
Asahi just happens to focus on hardware where Xorg's flaws are more obvious, so X will be more broken than usual. But it reflects the future of Linux graphics.