Well I guess the idea of “political correctness” is a rather nebulous topic. I think when most advocate for it, it’s in an effort to promote inclusion (and everything that comes with that - including doing away with disparaging stereotypes).
There are certainly a select few who take it to the extremes, and are sensitive about everything for the sake of it, but that’s not really what’s at the heart of it and it’s an aspect of the issue that the outrage against has blown out of proportion. Most people advocating for political correctness aren’t advocating censorship, more like advocating thoughtful consideration about how we conduct ourselves in regards to underrepresented peoples. It’s more nuanced than people make it out to be.
While the term is certainly new, I think the mindset behind it is not. I don’t care to get into semantics here or the negative connotations people have placed on the term. What’s important is the general idea at stake.
Saying Chekov wasn’t to promote inclusion is neglecting the point. The idea of promoting inclusion and showing peace on Earth aren’t mutually exclusive, in fact I think they are very much part and parcel. Everyone is welcome in Starfleet. Everyone gets along. That’s kind of the whole idea.
Whether or not the portrayal is stereotypical is just the next step in the same line of thinking. The goal is to show we’re all the same and in this all together. First step is showing the Russians aren’t the enemy. Next step would then be to not portray them as a simple caricature, but as a real person, just like everyone else.
If you can’t see how the ideas aren’t related, I really don’t know what to say.