Sorry, have you seen on the internet? There is no requirement of professionalism: write a catchy title, get people to read what you had to say.

HN isn't an academic publishing track, it's a reflection of what the world actually posts on the internet. You're free to not like the titles some people use to get eyeballs on their content, but this was clearly not clickbait warranting removal, and it's certainly not HN's job to police page titles on the wider web: we just upvote the cool content, and if enough people like it, it hits the front page.

So really, you're complaining that not enough people on HN mind catchy titles enough to downvote a post based on its cover, rather than the book it links to =)