A stance of "here's some hardware documentation, implement the drivers yourself" definitely falls within that spectrum of "support", and is the kind of "support" for Linux that some hardware vendors have in the past been lauded for, eg. when AMD started documenting their GPUs.

That level of "support" from Apple for running Linux bare-metal on Apple Silicon would be an improvement from the status quo, and in practice would probably be sufficient to get good drivers written and upstreamed in short order, given how much interest there is in running Linux on these devices.