Did you actually read this review? The only overtly political thing the whole review points to is that 3 of the central characters are either minorities or mixed race. How does that make it political? To keep with young adult fiction turned into novels, was Hunger Games political? Both the bad guys and the heroes were white, but I didn't sense the color of the actors to be a "political" act in and of itself. The same goes here. I don't understand why just the color of the actors makes something political. Now there may be other messages, but this review/article/jumble of thoughts doesn't really touch on anything else, simply talking about how having a mixed race girl interested in science as the hero is political. It's not. It's a casting decision.
People these days read way more into what they want to be political or not. And most of the time it just depends on their own point of view. Go and enjoy the movie if you want. If the race of the lead heroine is causing you problems, that probably says more about you (in the generic sense of the "yous" all over this country/world) than it says about the movie.
Now if the movie has other themes, issues, that stray from the book, fine, maybe it is political. But on the single issue this article picked up? I'm calling people trying to make a mountain out of a molehill, which is sadly much too common these days.