I'm so much less interested in discussing one guy's style than I am in the real point he's making. Nobody's going to remember this blog post in 2 weeks. But startups are going to continue running aground on the mistake he's pointing out.
Note carefully: by "gets it", I'm not saying he gets, like, "the universe", the "ineffable 'it'". I'm saying, the thing you don't think he gets, that there's a real material cost to ignoring design, he probably does get. The fact that bad design has a cost isn't dispositive, because the cost of bad design has to be weighed against the benefit of spending that effort somewhere else.