Because you're attacking an HN regular for trying and failing, when he already admits he has a lot to learn (and failing teaches you a lot) and just wants to make something useful for people. It's not kind to attack people for failing and goes against the HN ethos, because the only real failures are those who were too timid to ever try.
I understand you were replying to someone else's comment, not any claim Jason made. You may wish to explore ways to be more diplomatic, or hold back the attacks if you can't find a better way to express yourself.
Track-record as in has actually launched products. You can look at that as not being much, or you can look at it as being more than someone who hasn't done any of that, which would include a good number of people reading this.
Interestingly - I always kind of felt & have seen the opposite, all of the people I know from HN have indeed launched something, although my sample size is only 6 people.
I'm not sure that has any basis, surely Jason is a nice guy, but the only track record I am aware of is:
Some random company - Social startup which never went anywhere long term, but had decent buzz at some point (iirc).
Publictivity - Which the towel was thrown in on (& may go open source)
Ramamia - Started with Mark Bao which seems to be barely lingering (http://siteanalytics.compete.com/ramamia.com/)
I'm not sure if that is a track record.
[EDIT: Downvoted for disagreeing with someone & backing it up - anybody care to explain why?]