Oh, that's some BS! I shouldn't be surprised that they removed the button and require some special task to bring it back. They just more and more act as though they hate their produc--err... customers.
I use the Enterprise SKU of Windows 11 and you can fortunately still use the Domain Join option with that. Comes without that advertisement crap as well. The only caveat is that you can’t really activate Enterprise legally without a subscription and KMS but there are ways to circumvent that issue ;)
This is a bit of misinformation. It only removes the stub shortcuts to installing the bloatware and games. Its a very cheap hack and not as effective as debloating Windows using either the Ameliorated playbooks or Chris Titus' script tool, which are just about as easy to do while actually being orders of magnitude more effective.