This is an article about a reddit post, with literally zero extra information, the writer just reworded the post and collected OP's comments, but missed the most important, that this is an old project:
Look up the Renegade Project. iirc the center piece is an old Qualcomm powered tablet that uses the same GPU as the one in snapdragon 845, which gave us a DirectX 12 driver and I can verify that it can run GameCube games via Dolphin with full DirectX GPU utilization
There are drivers only for these processors since Microsoft made their Project Voltera (Microsoft Dev Kit) and it has Snapdragon 8cx gen 3 which drivers are compatible with most phones with snapdragon 8xx line SoC's. I think that touch and screen drivers are made by other devs but the main thought was that Microsoft created drivers for these processors themselves and Project Renegade created custom UEFI for these devices. That's basically it
Comment about the install steps:
I installed UEFI, injected drivers for my phone in the original windows 11 for arm iso, then partitioned my phone's drive via ADB shell and parted program. Then flashed uefi, flashed windows files, created a boot system on the esp partition and it worked
The reddit post: https://www.reddit.com/r/Windows11/comments/1h9bblk/i_managed_to_run_windows_11_on_a_phone/
Via a redlib frontend: https://redlib.privacyredirect.com/r/Windows11/comments/1h9bblk/i_managed_to_run_windows_11_on_a_phone/