Whoever wins that amount I hope he can post here and verify the winning I'm not comfortable that the owner or representative is the one posting it here, although there is nothing wrong with it.
If the winner have an account here why not, but i don't think he will or so. If the screenshot is posted by OP is the winner's profile history page, he probably a huge bettor, considering he was just lost $7k bet and the win is just a normal win to him. Its just that it was the highest recorded win in the platform as for OP but who knows.