He means that in the sense of the either-or fallacy[1]
32 karma · joined February 19, 2013
Another hypothesis is that those are two largely disjoint populations on HN. With the smaller one displeased with the article and is likely to express that in comments. The other, larger one is pleased with the article and doesn't bother much with comments.
You probably do still have a 32bit system so you're still capped at 4GB of useful memory. I'd still upgrade my system if I were you.