Roy Bhaskar certainly developed dialectical materialism in his work, particularly focusing on different moments of the dialectic. For instance, in dialectical critical realism, he described transformation like this: absence→absenting the absence→transformation. However, in his philosophy of metaReality, which he first proposed in 2001, he began exploring the nondual ground state which, he said, underlies everything. Is that ground state material? I don't know. I would say it is natural, assuming that the term "nature" is broadened to accommodate what he called the cosmic envelope. Also, in 2000, Bhaskar indicated that he also believed in something like reincarnation. Roy went through a personal transformation beginning with his transcendental dialectical critical realism in 2000. He also spent some time in his father's homeland of India.