I think what I find annoying/confusing is that on HN articles that have to do with PhDs are voted up and people are generally pretty positive about PhDs, rather than emphasizing that they are a waste of time to people interested in start-ups.
HN doesn't seem like the appropriate place for PhD info.
HN is no longer just Startup News, as it used to be. Topics which are of intellectual merit appeal both to startup founders as well as to PhD students. Hence the large number of PhD HNers and generally rosy picture of PhDs.
But I agree with the grandparent that getting a PhD is somewhat opposed to doing a startup (although you need many of the same skills for both).