Deplatforming is not the only form of external pressure applied in the academic world. Getting entire university departments closed, for example, is considered a bit more final and effective.
Also, it's interesting that even the very ideological "FIRE" group (not exactly a neutral player in all this) shows roughly 60% of user-submitted cases being deplatformed "from the left", which is far from overwhelming.
The scientific sciences are also more right wing, the more you go to the softer sciences where opinions are everything the more left the professors lean.
So your observation is just "left wing professors often work on unscientific subjects and therefore more often gets their department shut down". It has nothing to do with politics, if you had a department full of right wingers who called their blog posts "scientific papers" then I'd call for them to get shut down as well. Blogging is fine, just don't call it science or make university courses based on your blogs.
Your mind is going to get blown when you find out there exist whole departments at universities that aren't sciences, and that there's kinda of a tradition of academic scholarship that goes back centuries in the humanities.
Deplatforming speakers is largely the left's MO.