I chose that term carefully, and put it in quotes, to avoid derailment about my choice of words. I wanted to make it clear I'm referring without judgment to the types of people he is talking about, and was willing to make my short comment clunkier in the name of keeping it precise.
But the clunkiness you're saying is in my comment, not his essay. The essay includes the words "heretic hunters", but it's only used once:
> I've deliberately avoided mentioning any specific heresies here. Partly because one of the universal tactics of heretic hunters, now as in the past, is to accuse those who disapprove of the way in which they suppress ideas of being heretics themselves. Indeed, this tactic is so consistent that you could use it as a way of detecting witch hunts in any era
Personally, this single usage and less-clunky grammar doesn't strike me as especially bad writing.