His point is that for these things to even be investable, there has to be a widespread desire to make them happen. Pointless to invest in things that governments (local, state and federal) will block forever and that NIMBYS have control to block. He's trying to help change the conversation and mindset at a time when people may be more receptive to the idea, and that's very powerful. It's not lack of money that keeps all these things from happening -- there's clearly plenty of money when needed -- what's lacking is the actual will to make it happen and a vision of a better future.
To say that because this VC firm isn't investing in infrastructure that they don't really want to see it happen doesn't make sense. Everybody has a circle of competence, and they are experts at software and online stuff, and they helped build the internet.
That's like saying that I can't be in favor of building more solar farms and nuclear plants because I haven't invested in solar power and nuclear.
Ben Thompson wrote this on the essay: