Just read through the HuffPost article.
It starts While the letter itself, published by the magazine Harper’s, doesn’t use the term, [cancel culture]
Near the end If “cancel culture” is a term that encompasses both the famous and the nonfamous, social media mobs and risk-averse employers, firings and consumer boycotts, then it means nothing at all. It is, like “political correctness” before it, simply a name people give to things they do not like.
So the whole article which repeats "cancel culture" again and again, thinks it's a meaningless term like political correctness. Yet the letter writers never used the term.
What is great about this is that the writer then goes on to say how they do a podcast showing how people misremember controversies because they are misrepresented in the media.
Exactly like he does in this article.
Oh, and this bit
Declaring support for J.K. Rowling in July of 2020 is a de facto statement that you agree with her controversiall, unpopularr views on transgender people.
Has he read what JKR wrote?