Hmmm.
Yes and no. The question/answer is of degrees.
I can't point to a categorical set of submissions/comments to provide you with some perfect bouquet of HN circa 2008 vs 2012 or such.
Essentially it started out more as hackers figuring out how to hack becoming entrepreneurs or making things work - to entrepreneurs or startup founder babies figuring out what to do. So HN was more geeky initially, and the techie perspective of what startups are doing.
Now it's slightly more towards the startup side looking at the tech perspective.
This is all relative. If you compared HN crowd to the WSJ and it's consumers, this site would be far and ahead a site of techies talking tech stuff.
I hope this helps, because this is making a risky argument since it's subjective.
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Part of this is covered by basic theory of websites - initially a site has a simple good or utility, (information, expertise) and attracts only people in the know. They come to discuss their field.
Eventually, if the knowledge allows people to get ahead, your culture shifts, as more people come to the site. Your experts to normal concentration shifts. PG has a good article on this, he identifies what he calls midbrow arguments.