But the thing is the show made it clear that at least two people are to blame for the accident. At the beginning of Legasov's presentation, he explains that the reactor was taken down to 700 megawatts and left there for 10 hours. This caused xenon to build up in the reactor core which choked it which is why the power level couldn't be brought back up during the test. And that happened because the test was originally supposed to happen right after the power level was lowered but some factory asked for the power to remain high until after dark.
Had there been no xenon buildup, Dyatlov's actions would have been reckless but would not have resulted in "pulling the reactor back like a slingshot."
It was Fomin who decided to keep the power level that low for so long and then move forward with the test. He did that because he was so focused on promotion (and probably also had no idea how a nuclear power plant works). Had Fomin made a different decision, the disaster at Chernobyl wouldn't have happened. All of this is clearly depicted in the show.
If you're going to fact-check the show, you have to get the facts right.
Edit: I've read the article again and I see that the article itself points at three people. For some reason, the quoted post here talks about one person, but the New Yorker article doesn't. I'm going to leave my post up, and I think others are making the point much better than I am.