Yes is true, I run with CPU MAX off for testing driver and more. Now with CPU MAX on, the installation take 15 min and the processor is only on 3%. You can play video and music, but when you run Windows Update you can do anything...
I only know of 17763.1: https://forums.mydigitallife.net/threads/windows-10-svf-repository.63324/page-189#post-1565036 ps, this project runs ARM64