If you read it all, you'd see it was infact, not wrong...
It says "Probably came from" and then goes on to say that "manhole covers in cities are nammed as such because of the "men" who use them for access"
Did you write the blog, date it back a few years and then pass it off as fact? Because honestly, it's content is one person's interpretation from a profession completely removed from the type of work associated with that skill, passed off as fact. I'll pass and put this down to another poor attempt by you to be intellectual. Keep going though, your day will come, but for now, we need the entertainment in our lives.