The price of insurance jumped massively every year from the start of Obamacare to 2018. The fact that this has apparently mostly stopped now is the unusual thing; 2017-18 was a pretty typical year despite Trump's meddling. The article you linked suggests that this is because insurers have finally increases the cost of insurance to be in line with how much it actually costs them.
Last year saw a drop (down 1.5% in the 39 states using Healthcare.gov), and 2020 looks small thus far as well. https://www.politico.com/story/2019/06/03/obamacare-rate-hik...
I, quite frankly, trust my state more than my employer in a fight against my insurer. I obtain coverage via the NY exchange.