when library provider asks for "do not use any model"

To my understanding the stance was only really communicated after/because of this ticket ("For everyone listening: I added explicit disclosure of how output to stdout has changed"), and probably still isn't something that most downstream users are going to see.

In general I'm not too sure about a project that is using, and has accepted contributions under, a Free software license trying to then restrict what tools you can use. To me that seems largely against the principle of a Free license. You could get contributors' permission to relicense their work to a non-Free license if you wanted to restrict the tools that users of the library can use.