"Frankie is tied for most HOH wins in a single season with four. Drew Daniel, Janelle Pierzina, Hayden Moss, Rachel Reilly, Ian Terry and Aaryn Gries have also accomplished this feat."
He's also had more opportunities at HoH compared to all those who won. As opposed to win HoH, the houseguests had two opportunities and even could've competed the week after. Mathematically, the houseguests this year had an advantage and thus were able to win more competitions. I would count a HoH win if you remained HoH. Hypothetically speaking, someone could've won HoH every week, if there nominees always won BOTB. So your argument is irrelevant.
