please dont think that I am doing this,
No worries, I'm not accusing you here, I just wanted to point out that there is nothing to discuss.
Myself and others warned him and told him about your policy
So you did already what I would have done too. What I can't and won't do is go in there and start making legal threats because I'm a self respecting person and I love myself :)
Samples should be released under a different license, the GNU GPL is not suitable.
Yes, the sample licensing is a bit of a grey area, but we're going for the most practical solution here which is as long as you license them permissively enough so that people can use your GPL licensed plugin / rhapsody library, you're fine.
however if you're using scriptnode networks or other things that include elements from the HISE codebase you have to follow the same rule
That's not 100% true. You can of course use scriptnode and anything in HISE in a Rhapsody player project, however you can't export them to a C++ module (because the Rhapsody player is already compiled so it can't load custom C++ stuff). So this is rather a technical limitation than a legal one.