It's not that Apple Silicon can't run it it's that Windows for ARM is only officially available to OEMs it's not something sold to the public. So Apple can't officially support that.
Obviously they could if they wanted to but that would compromise their new boot security.
No, as people here keep trying to explain Windows for ARM
wouldn't "just work" on Apple Silicon if only MS sold licenses (which, as several posts have already confirmed, they
do) and Apple gave the thumbs up. Intel Macs were a gnat's whisker and a missing EFI firmware module away from being PC clones with nicer trackpads - on some models, you could just stick in a Windows XP DVD and boot the regular installer. Bootcamp
assistant was exactly what it said on the tin - a point and click assistant that smoothed some of the rough edges. In particular, the graphics was provided by bog standard Intel, AMD and (early on) NVIDIA GPUs which already had Windows drivers.
In contrast, about the only thing an Apple Silicon Mac has in common with a Windows on ARM machine like the Surface X is the ARM instruction set (and there are even some gotchas
there). Windows is not going to boot on Apple Silicon without some significant changes under the hood, to bootloaders, installers etc. including a ton of newly written drivers for I/O etc. and - in particular - native Windows drivers for the Apple Silicon GPU, which is very different from anything on the PC. Boot security
is part of that problem but it's not the whole problem. Windows 11 on Apple Silicon would be pretty useless without a good, native, accelerated graphics driver.
So - sorry, conspiracy fans: licensing issues, the Evil Overlords of Planet Q'ualcomm etc. may have a role to play, in this but they'll have to take their turn behind "Bootcamp for Apple Silicon" simply being easier said than done. It would surely be possible with effort, but it's as clear as mud why Apple would want to promote the Mac as a Windows machine and/or why Microsoft would want to promote a CPU that was only sold in Macs & couldn't be licensed by the 101 clone maker that are the backbone of the PC market.
Running WoA under Parallels, VMWare Fusion or UTM is another kettle of fish: hypervisors can emulate hardware/firmware environments that
are supported by WoA and things like graphics are handled by "stub" drivers that take Windows graphics calls and pass them to the official MacOS drivers running on the "host". Apple have clearly said that they will support alternative OSs under virtualisation,
not direct booting and, if you read it in context, Apple's "up to Microsoft" comment was clearly referring to using MacOS's virtualisation tools (before Parallels and VMWare stepped up).
Last I looked, Asahi Linux didn't have accelerated graphics - maybe not a problem for many of the things Linux users want to do - but Windows users going to the rouble of running BootCamp rather than virtualisation often do so because they want
better graphics performance - particularly on AMD. BootCamp'd WoA without decent native graphics drivers isn't gonna be a lot of use - Parallels would probably do better - and DirectX-optimised Apps are probably never going to shine on the Metal-optimised Apple Silicon GPU.