The assumption that “stupids” are going to be more receptive to long-form/from-first-principles arguments is wrong, I think. So is the assumption that that’s why rationalists write that way (it’s more likely because of bubble culture and/or because people like hearing themselves talk).
What makes you think the author has poor reading skill?
I'll cite an example: https://www.lesswrong.com/posts/qDmnyEMtJkE9Wrpau/simulacra-.... I can make the case that one might feel smarter simply having read through the grating writing.