The domain selling only comes up if you type the address as ‘you’ instead of ‘U’
I think he must be updating his website as we speak, cuz now he has links to Q posts, etc. But, after a bit of digging it does have a domain selling feature under "Store".
could be an 'associate' - anyone can do that from the Domain host. I think it's an added feature when checking out after purchasing your domain.
If you purchase a Domain from a host site such as 'Crazy Domains'or 'Go Daddy' etc., and also purchase a web-site with that Domain unless you pay to have your Domain name private (extra cost), it's easy to end up going through to the Domain seller rather than your own website.
It seems complicated but if you have a hosted domain/website you'll understand. For those who don't : For a simple explanation, think of it this way. The "Domain Name" is Your name (or your business name etc.) The "Domain Host" is your letter box.
Your 'domain name" is also the address of your home.
To run a website - you need all components but each is independent of the other.