How do you propose HN's anti-spam filters and Mod(s) check submissions? While I take your implied point about inclusiveness how many different languages do you expect the spam filters and Mods to be fluent in? One? Two? More? That opens you up to “What-About-ism”
In my opinion there is nothing wrong with a website starting up (and keeping topics and discussions) to their lingua franca. As a neutral-ish example – What if I went to a .ru forum and posted something Swahili? Chances are high that it would be flagged/deleted because Swahili is not a language they speak (the mods) and so they have no way of checking to see if it is a Viagra spam or a meaningful contribution.