I don’t want the user to see the error, I just want the browser/the operating system’s resolver to not be a stub resolver, and actually ask the authoritative servers when something like this fails on a non-authoritative response.

Public DNS like Quad9 should be a cache (because recursing is pretty slow) and, at most, a way to find the IPs of the root name servers.

Courts asking non-authoritative resolvers not to resolve a name should have no effect on clients successfully resolving that name, such that they wouldn’t even have a reason to go after Quad9 or Alice and Bob, and would have to go after the TLD registry (likely in a different jurisdiction).