I expect this would be in the context of someone from the "illiberal left" (a perhaps biased term, but the one used in the article) having already asserted the

I expect this would be in the context of someone from the "illiberal left" (a perhaps biased term, but the one used in the article) having already asserted the opppsite to one or more of these statements, and being corrected for it. In particular, such assertions are often observed in discussions of gender issues.