I think it’s not factual unless you think niche means something all the most populated states do except for Florida and Texas.
And even then, it’s an urban/rural split, and it’s pretty clear that the urban areas, which contain most of the US’s population, support those policies. Unfortunately, political power in the US is not apportioned to individuals, so this widespread support of policies is not visible as enacted policies.
Again, neither the author nor I are giving any personal opinions or moral appraisals.
I think it's pretty factual to say that support for these things in the US does seem to be much more niche than it is in other countries.