DNS is for associating various information with domain names, and looking that information up. Yes, the most popular information to associate with a domain name is IPv4- and IPv6-addresses via A and AAAA fields; but CNAME records exist as well, you know.

This is not even CNAME, more like a Redirect header in DNS (if this was actually a thing, that is).

Still, this is arguably a domain name system, just one that isn't compatible with the DNS as we know it.

Many record types contain hostnames as values. So many that it isn’t even worth listing all of them here.