It is not narrowly scoped, it states that we need to stop another "wave" of "social justice piggishness" which would include challenging the gender identity framework the author is using among other things. It also makes broad claims about social justice politics writ large.
Having read it carefully I found the hn thread interesting and it correctly criticized the essay's lazy reasoning.
Unless pg just now edited it out, you're making false quotes and misrepresenting his words.
I cannot find the quote "social justice piggishness" or the word "gender" in his essay. Every single mention of the word "wave" is attached to "wave of political correctness" or a close variation thereof.
Edit: OP meant "priggishness". Got it.
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Sorry my mistake I meant "priggishness"
I don't think pig and prig mean the same thing.