Earlier quoted context omitted.
Simply put, editorial and opinion sections are supposed to be like that. It's not an error; it's by design, and it's a design that has existed for as long as editorial and opinion sections have existed. You, as the reader, are expected to be know enough about how newspapers are organized to tell that you're reading part of the opinion or editorial sections and what that means. In an ideal newspaper practicing journal…
One problem I have with it, though, is that often all the most popular articles in their site, are the opinion pieces. I'm still a subscriber, but there's a strongly "promoted" bias, IMHO, and it requires reading news from several sources with an open mind to get the complete story. Also, NYT isn't immune to click-baity titles, where the meat of the story isn't necessary correlate with the title.
It turns out people like to read other people's opinions. Who'da thunk?
> I'm still a subscriber, but there's a strongly "promoted" bias, IMHO
If you want a balanced overall view of the day's news, the place to start is the front/home page, not the "Most Popular" list. Newspaper editors spend extraordinary amounts of time agonizing over exactly what stories should go there and how much prominence to give to each. "Most Popular" skips all that in favor of the "wisdom of the crowd," which it turns out is not all that wise.
(If the nytimes.com home page still contains too much opinion for you, you can get a digital edition of each day's print paper's front page at this stable URL: https://www.nytimes.com/section/todayspaper)