I think it might be a glitch on runetrack when people update their account after changing rsn. if not wow....
Not possible, if he made like 1m xp per hr, and played 24hrs a day he still wouldn't be able to do it.
There was a thing on Runetrack where you could change your name and make a new profile. Making a new profile obviously allows you to go for new records and pretty much whoever had the most xp in the day/week/month got the record. That's most likely what happened. Edit: I guess they got a new account because the old account with that name got deleted from the game.
The user could of gotten enough zeals on a level 3 account to get all 6 skills you can from Soul Wars to 200M xp had alot of dg tokens and other things like that.