You are right about the personal exchanges. My bad. I apologize.
Beyond that, it's apparent that Mr. Proyect either is backtracking from his stated opinion, or isn't willing to expose it to debate. I strongly suspect the latter, but 'nuff said. A world without cities is as scary an idea as it is an impossible one. Every socialist (and every thoughtful person) knows cities as they are now aren't sustainable, but that trite observation is a world apart from saying "urban life is unsustainable." But that's a trite observation, too, isn't it?
Peace.