It’s not proof. Really, without named sources and evidence it might as well be political fiction. But there’s also no one else who had both the means to do it and the motive to do it other than America. Every other party that would benefit couldn’t have pulled it off, and of the parties who could have pulled it off it really is just the US and maybe, maybe someone like Norway if they had their best commandos and their best oil rig divers work together?