I do understand that we still want to keep the old links like spins.fedoraproject.org. Fedorians invested a lot of time to create them too.
But I could already find comments in the internet/youtube that the new website partially is not ready yet.
It is not true, people just not understood that we do have a single domain yet.
So i guess it would make sense to make a comment on the subdomain pages that there exists a new version of this sub-domain pages and how they can reach them.
https://spins.fedoraproject.org is not direct reachable over fedoraproject.org/spins there comes a
403 Forbidden
error
Correct way to reach the url is using the fedoraproject.org page and select “get fedoa” menu point and choose what they like to see in the sub-menu on the left hand side (on big screens).
Other toughs I had about the subdomains is to retire them in the future, while rename them as an example like old-spins.fedoraproject.org and not let this archives index anymore from search engines. So we can still use the original sub-domain to redirect to the archives, to give users outside of the fedoraproject.org time to change links in howtos/manual too.
I am sure it was the right step to make the official website as a single domain. The feedback in the internet so far is also very positive about this change.