The commit message, which @ChrisA helpfully linked, and @unman’s post both explain the situation clearly. You can also read this thread for even more context:
If there is still something unclear, please be specific about what exactly is unclear, and I will do my best to clarify.
As far as I know, you couldn’t have followed those instructions when installing Qubes 4.1, since the installer had changed so much, which is why that page was so problematic.