Commit... asked Swen... when they last voted. Now that question is only meaningful if the region Seen... lives in even uses e-voting, so Commit... seems to either assume that Swen... lives in the same country or that virtually all countries use e-voting. Either option is US-centric - the first is pretty obvious, the second is more along "we do it like that, so all the others probably do it like that as well" (I'm US-centric as well, assuming the mentioned 2016 election was the US presidential election).

It's not like this is inherently bad or anything like that, it's just a remainder that sometimes the inhomogeneous composition of the HN commenters should be considered. And as you pointed out, that's also the case inside the US.

Also, others used the opportunity to state how their country/state uses (no) computers for voting. So there seems to be some meaning to it.