That description is used way too loosely and is why I agreed only in a general way. A Marxist at minimum would have to be someone who has actually studied Marx -- a lengthy, difficult task -- and buys into the basic ideas, including the inevitability of a global "dictatorship of the proletariat." Any old loopy, self-contracicting line of reasoning doesn't fit the bill.
I doubt whether any of these clowns have read any Marx and they certainly have nothing but disdain for the proletariat, or what they call "a basket of deplorables." They clearly want to put self-appointed elites like themselves in charge.
In a popular sense, though, "communist" is a better term, given the elite-dominated system that described itself as such in the Soviet Union and currently claims the title in China. But even in these two cases the term isn't technically true since no one can reasonably argue that ordinary working people were or are running the show in those countries.