I just saw this movie and was waiting for the Liberal agenda. I do feel there was a subtle one although the strong points of the movie overwhelmed it and made it less obtrusive.
Setting the story at the time of the Great Depression is anti business. Making the writer the hero (he is unattractive, puts his art above commercial success, etc.) is very PC. Making the audience for Kong a bunch of callous rich people is PC. Sending the heroine to a burlesque show could be pro feminism. The only non PC thing was the movie actor action hero actually comes back to save the day on the island. Also, the military looks cruel and heartless when they shoot the ape in the back (leftists hate the military).
But I did like the movie as all the PC crap was buried beneath the main story.
I don't think any of that stuff you cite is notably PC in this film. In fact, much of it is present in the original film.