Moldbug isn't arguing we should get rid of some technology and its comfort in order to also get rid of universalism and he certainly does recognize both as major aspects of modernity, no he is saying that precisely technological progress now enables us to get rid of the parasitic aspect of modernity "universalism". One can make a case that since it inflames some biases, it is slowing down technological progress and the benefits it brings. Peter Thiel is arguably concerned precisely by this influence when he talks of a technological slowdown. Universalism not only carries opportunity costs, it has historically often broken out in Luddite strains. Consider for example something like the FDA. Recall what criticism of that institution are often heard on LW, yet aren't these same criticism when consistently applied basically hostile to the Cathedral?

Whether MM is right or wrong what you present seems like a bit of a false dilemma. You certainly are right that we haven't seen societies that advance to a post-industrial or industrial state without at least some influence of universalism but it is hard to deny that we do observe varying degrees of such penetration. Moldbug's idea is that even if we can't use technology to get rid of the memeplex in question by social manoeuvring we can still perhaps find a better trade off by not taking "universalism" so seriously. The vast majority of people, the 90% you invoke, may be significantly better of with a world where every city is Singapore than a world where every city is London.

It is no mystery which of these two is more in line with universalist ideals.