Germany has roughly the same ratio of English speakers to the above and this is an English language site. 23m vs 45m vs 17m respectively.

Does it?

May it be that HN is more or less known among tech workers in country “X” (eg: due to language, etc…)?

Sure, you can even say that both France and Germany just have larger populations than Italy. But still I would argue that being open to the international tech scene is pretty important to have a local tech scene. It's also crucial to keep up with innovation.

Would you say that consuming HN is some sort of "benchmark" that measures how open a society is to the tech scene?

or maybe Italians are more likely to be doing something else on a Friday night?

Or what they are doing at the time this poll came out.