You are correct. the author clearly missed the mark with their lack of a DEI statement. We should file a complaint with the Thought Police, then start a social media campaign to ruin his career.

Letter from a “prominent” medical school professor:

“..This is affecting clinical medicine. It is the death spiral of American medicine, with unintended consequences for the very groups it is supposed to help..”

Seems like an extremely important — if difficult —topic

How so? I think people can discuss to what extent their experiences align with what's described here.

Wikipedia says of Quillette:

Described as libertarian-leaning, Politico and Vox reported that Quillette has been associated with the "intellectual dark web", a term used, according to Politico, to describe "a loose cadre of academics, journalists and tech entrepreneurs who view themselves as standing up to the knee-jerk left-leaning politics of academia and the media.

So yours is a totally fair question.

If this is indeed a topic worth debating, then there must be better sources.

Not necessarily. https://larrysanger.org/2020/05/wikipedia-is-badly-biased/