The two PC terms are not related. In the start of the last century political correctness was about the correct adherence to ideology. The modern PC is a describer coined by us conservatives to label progressive political goals.
I think this was originally a kind of joke but referencing a real phenomenon in soviet-style regimes. Like http://www.catb.org/jargon/html/H/ha-ha-only-serious.html
Now just how much this Western lefty culture was influenced by deliberate influence ops, that's the question I was hoping to learn about from this interview.
Similar to "woke". A term used with semi-seriousness, later coopted and weaponized by political opponents.
Political Correctness in the soviet union was very similar to what we have today. The "Girl Boss" stuff pushed by Sheryl Sandberg is eerily similar to Stalin's "New Soviet Woman".