I read the article but failed to grasp what exactly the disaster is that America would be walking into.
Is the reliability of Polymarket predictions overhyped? Sure. Is there manipulation of Polymarket odds by some people? Most likely there is. But to say that this is a disaster that America is walking into is nothing else but clickbait.
The disaster is the consequences of people treating the data generated by these prediction markets as revealing some sort of insight into future events, rather than just a silly game played by silly people.
I guess journalists don't like markets?
I think you are underappreciating how "manipulation of poly market odds" can be destructive when you are betting on geopolitics. Here this means that every decision is now a conflict of interest, and that doing the unpredictable (politically, economically etc) has a financial incentive for potential insiders. Sounds pretty dangerous to me.