i dont see anything that indicates hes a hacker, he could have got in, logged out and logged back in later on(assuming you log back in on the same spot, i dont have the game).
side note, i only watch the first video where you died, no sense in me watch another if i cant understand what youre saying. :P
To be honest you shouldn't try and comment on this matter if you haven't played the game and haven't experienced things for yourself. Not to be a dick but this is matters related to in-game experience of which you stated you have none.