We already deny communities "community voice" in all sorts of issues. The list of issues communities aren't allowed to determine for themselves is called "state law", and there's a lot of it. Demsas (Twitter has stripped some of this context off, which is probably part of why it seems insane to you) is advocating for blanket SFH zoning to be added to the list of things communities can no longer decide for themselves, because when you let communities do that, they naturally and with near-mathematical inevitability (literally, as in the forces that lead to this are almost mathematically inevitable and have nothing to do with equity or justice or privilege or anything like that) work to exclude multi-family housing.