> It hasn't been doing okay ever since Elon bought the site
No, it hasn't been doing ok way before that, if you accept the criteria that the article purports to have (like supporting scientific discussion and surfacing complaints of dissenters, ignored by the mainstream sources) as the face value. Of course, that would be silly, because the real purpose of the article is to say "see, a bad man from the bad tribe took over Twitter and it's all awful now".
> because his purchase saddled the company with so much debt that he basically had no choice but to drastically change course.
He didn't hide his intentions to "change course" from the start. So it's not something that anything forced him to do - it's something that he bought it for. You can argue he was wrong to want it, but it's certainly was the goal, not a consequence of debt or anything else.
> the pretense that the site is doing just fine and that reports of its death are being overblown by a bunch of people with political axes to grind is _also_ a narrative
Of course. To argue against this narrative, one has to define what "just fine" means. I saw useful links on twitter before (occasionally), I see them now in pretty much the same quantity. Is it fine for me? Sure. Somebody got their safe space bubble ruined. Is it fine for them? Probably not. How do I generalize that? I don't know. I certainly know people with political axes to grind are significant part of the crowd claiming it's not fine, and this article provides massive amount of evidence for that. But yes, I do not know if there are other significant groups of people whose problems are of non-political nature, and how big these groups of people are and how vital their presence for twitter. This article is no help to me in that question.