Dualism is a failure to get to the fundamental truth of things, but it also requires that one actually posits two things, that is, that he posits multiple principles or explanatory schemes in the same genus.
There is, for example, a real dualism in our explaining one sort of phenomena by Relativity and another sort by QM, or in having more than one physical law or theory, or in positing a good and evil god or a good and evil will to account for natural or human actions. We know a priori from the mere duality of these things that they cannot be final but point to some ultimate unification.
But positing matter and form as principles or material and immaterial agents as sources of action lacks this defining characteristic of dualism. Aristotle came up with the idea of matter and form while also denying there was any common genus for the active and passive, and his category “substance” does not include material and immaterial agents. Complaints about so-called Cartesian dualism therefore confuse the sort of dualism which needs to be transcended or compressed with an ontological division that is not a bona fide dualism at all, but only a trick of the imagination that there is some homogeneous category for matter and form, the physical and spiritual, or the creature and creator.
Briefly, there can be no dualism in principles of being because being cannot be dual. It has no genus, nor can beings or existents be counted, still less be two. You can count the books or shades of blue on your desk, but not the beings.