Louffy said cancel sidebets if you placed any, not that his own bet was canceled, as far as I know.
EDIT: never mind, another tweet confirms.
No, it doesn't. I don't know how Flash Metroid would know anything about a Japan-France MM except what he heard from someone who heard from someone. Whatever the final match $ (if any), it had to be mutually agreed or else the match would not have taken place.
Do not believe everything you hear on twitter.