The purpose of PC speech is sensitivity to marginalized people.
i.e. Unhoused people vs Bums
The purpose of doublespeak is to obscure the speaker's true intentions.
i.e. Torture vs Enhanced interrogation.
PC uses value neutral terms to replace inherently and unfairly derogatory ones.
Doublespeak uses ironic terms to hide their motives and cynically cast them as the opposite.
Doublespeak must BE corrected in order to understand what is really being said.
If I speak of "creative bookkeeping" rather than theft, I am trying to hide or minimize guilt.