I think on the whole, we actually agree on the mechanics of what needs to happen: slash the destructive waste and build the green infrastructure. Functionally, eliminating massive sectors is degrowth. You call it "advancement" because of the new tech. I call it "degrowth" because the total material footprint has to physically shrink to make room for it.
Going all the way back to your original confusion, I hope I've at least cleared up what I meant by "moderately conservative communist" -> essentially someone whose primary focus is conserving the physical commons against the destructive march of both capital and unchecked productivism. Given that we've mapped out where our versions of communism diverge, do you think lemmy.ml is still a good home base for a degrowth communist like me, or is there another instance where this flavor of socialism fits better?