Whether you follow the FSF's lead is up to you!
The FSF itself changed the way it talks about these issues. Its "philosophical" writing used to distinguish "semi-free" or "source-available" and "proprietary". They even had a nice diagram showing semi-free as a middle ground.
At some point, they made a rhetorical decision to lump everything east of "free software" together in one "proprietary" pile. I wish I knew why. But the reason couldn't have been precision.