Except that is defined, that's a thing that's real, and the upside down red triangle specifically was used to identify political prisoners of the Nazi party, like liberals, socialists, and unionized laborers.[1]

I guess I'm not sure of your point, because to me, the use of the symbol, in a political context, and especially in the context of a polemic populist political campaign, is problematic, regardless of whether or not the Trump campaign or whoever backed that advertisement knew what it was.

[1] https://en.wikipedia.org/wiki/Nazi_concentration_camp_badge