That Krugman is saying something is good evidence that it is not the case.
This teen boy certainly knows more about markets than a Princeton economics professor!
So do most.
I'll take you seriously for a second: what aspect of this article do you disagree with? This article cites a few studies conducted by reputable organizations, interprets the data and draws the conclusion that the ACA has most successful in states where it has been fully implemented, if success means more people having health insurance.