There is certainly a lot of truth in this. Liberal crackdown on social sciences is clear example - they are demonised as "useless" while in fact they are anything but, bourgeoisie firm control on economics, sociology, politogy and history is one of the mainstay of their status quo.

It's nothing new by the way, it's very similar as ancient Romans forbidding teaching of rhetorics to anyone but their ruling class, because it was instrumental skill in any public career.