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I'm curious about this as well.
A friend on a Surface Pro 4 was able to run it, so at least it behaves okay with the 520 GPU.

I did try Final Fantasy X on a core m7 Windows laptop, and it seems to run fine and low setting. Of course,Civ 6 would have higher requirements, but I'm quite surprised that the Core m GPU can do it.
 
I've only played 10 minutes so far but seems to work fine. A little delay waiting for turns but don't think it's an issue with the macbook speed.
 
On my 2015 m5 Macbook, at minimum settings (like no shadows and everything) at 800p, it ran the benchmark at 13fps. That sounds bad, but if you play with a small map, it's surprisingly playable. Apparently people are getting twice the framerates with bootcamp, so maybe installing windows might be worth it (But i can't justify spending another hundred dollars on a windows license just for cviv 6)
 
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