I'm not trying to do a Marxist analysis in the sense of dialectical analysis or anything like that, but Marx takes particular care to specify that we have to look at real world conditions, not ideology to analyze events. Marx states himself, "As in private life one differentiates between what a man thinks and says of himself and what he really is and does, so in historical struggles one must distinguish still more the phrases and fancies of parties from their real organism and their real interests, their conception of themselves from their reality." Ideology can be distracting, especially in this sense, for we can't look at what Trump or Biden say but what they do. The real interests of the Biden camp are different than the Trump camp, as they represent different wings of the bourgeoisie (something I have elaborated on previously). That's the point I'm trying to make here, and that's why I say "material" to clue folks in that this is indeed a materialist way to look at the world.