Real objects are a-temporal for Harman, as in his system time is a sensual illusion, so they cannot be processes. This is where Levi Bryant initially tried to correct the dualist defect of Harman’s system, its simplistic bifurcation of object and process. Harman rejected all such modifications. Bryant’s system is quite compatible with Simondon, and it would be a good move on his part to incorporate more Simondon into his thinking.
Bernard Stiegler has recently come out in favour of re-reading Whitehead and so implicitly endorses the sort of Whitehead-Simondon-Deleuze-Latour axis that Harman is so afraid of. I take Stiegler’s critical comments on Latour’s “denial” of philosophy as a remark on the conceptual limits of his system rather than a rejection of it. Harman is very much the regressive thinker here.
Note: I am grateful to a facebook discussion with Yuk Hui for helping me clarify this point.