I do know that Louis Tomlinson is not gay. I know someone who saw him growing up (lived next door to him and his family) and he had a previous girlfriend. I've also heard things about his relationship with Eleanor which don't get published, such as their first anniversary celebrations, but show how genuine the relationship is. I have no other interest but I would dislike having personality traits etc ascribed to me when they are not true so that's why I want to post this about Louis now.
Also, having attended university recently as a mature student, it is very striking how much bi experimentation goes on these days, far more than when I was that age. Much of it is casual and what harm does it do? So if Harry Styles DID sleep with an American male as alleged here, so what? Dosn't mean that he is secretly gay, or bi. Probably just a one off, casual bit of fun, as is the norm these days.