To start, the HFT traders could not see the stops that the author mentioned. They might have guessed that they were there based on chart movements, but they could never have been certain.

Secondly, whining about your fair and legal competitors when they cause your losses is just crying in your soup. Zero sum game. Either you are good at it and you can beat them, or they are better at it than you. Cry if you want, but if you can't compete, you should stay out of the game.