The game is "starting" to become PC. And in fact, I'm a little worried about the future of the franchise. I've been thinking of making a thread on this. If our cultural and moral values change to the point where we see the depiction of colonization and exploitation as evils that have irrevocably harmed minority people, can we really endorse having these things in a video game? And yes, you can make the counter argument that video games feature murder on a regular basis, so are the above mentioned things that bad. We've already had some controversy over having the Cree in the game. I think some of that controversy has preventing introducing another Native American civ. There were some problems in seeing a people that expand as "winning", and the victory methods in general were questioned.
Keep in mind that there's push to rename high schools with Lincoln's name on them. The future is coming and all these leaders who once thought were great, are no longer being seen that way. And I'm not even going into the many infamous leaders the civ series has. Some of them not so far back (like Mao and Stalin).
I would say as compared to society, Civ6 is not too PC. But society is becoming too PC. And we may reach a point where the depictions of colonialism is associated with slavery and other such evils, and big corporations may not want to put their name on a game depicting those things. We've already had slavery removed from the game after all (though to be fair, it's not something that matters to me since I hated those mechanics in civ4).
How much longer until a game like Civilization is seen as little better than Custer's revenge? Okay I'm being hyperbolic here, but you see my point. This is the danger of politically correctness in games. I found myself enjoying playing Wasteland 3 recently mainly because it was not politically correct. It led me back to the glory days of PC gaming.
I think we're okay for now, the Civ series flies under the radar enough that not enough people care about it's depictions of history and civilizations.