Funny how some people are so brainwashed they assume anything that doesn’t match their own state propaganda is somebody else’s propaganda, not a honest opinion.
A couple of years ago I'd assume that someone who can't tell it's a joke wouldn't be able to create an account on HN, or - if they somehow succeeded - would die of suffocation by forgetting to breathe while writing a comment.
Nowadays I'm not sure anymore, so I tend to add "/s" in all but most obvious cases, like this one.