Having done the same three weeks ago: worked fine for me, but then, I did use my windows 10 dvd to install it, not whatever the latest .iso from microsoft is. Then I just ran through the standard "and now we wait for windows update to do its thing for the next few hours". Apparently only install images based on 21H2 won't give you the offline account option anymore.
It depends on the release, that's why. On home you need to disconnect the network. On Pro and business the option is always there but it does require a number of clicks.
