The post you're responding to doesn't even mention government investment; it simply says it's silly to be skeptical of a technology because you don't know that

The post you're responding to doesn't even mention government investment; it simply says it's silly to be skeptical of a technology because you don't know that it will work at commercial scale before trying it at commercial scale, because this is true of literally every technological innovation ever, regardless of whether it's publicly or privately funded.