member states must deny the rights granted to individuals by this resolution [...]
This is very wordy and it doesn't actually do what I think authors intend it to do. Right to assembly isn't granted by WA law alone, it can also be granted by national law. Thus, the nations could deny people the right under the resolution, but still grant it in their national law.
I would simplify it to:
Member states must forbid non-violent assemblies and associations that have the purpose of advocating, whether by action or inaction, for:
a. ...
b. ...
- such assemblies and associations may not be construed as protected by this resolution.
Or something like that.
Good luck!