I don't know about anyone else, but to me a lot of bot traffic is very obvious. I don't have the expertise to be able to describe the feeling that low quality bot text gives me, but it sticks out like a sore thumb. It's too verbose, not specific enough to the discussion, and so on.
I'm sure there are real pros who sneak automated propaganda in front of my eyes with my notice, but then again I probably just think they are human trolls.
> but it sticks out like a sore thumb
Could you give some examples of HN comments that "sticks out like a sore thumb"?
> It's too verbose, not specific enough to the discussion, and so on.
That to me just sounds like the average person who feels deeply about something, but isn't used to productive arguments/debates. I come across this frequently on HN, Twitter and everywhere else, including real life where I know for a fact the person I'm speaking to is not a robot (I'm 99% sure at least).