Apparently he had items with pretty much perfect stats
Discussion
meaning?
explain in runescape terms
From the reddit thread 
Of course, he did. It's not that he just lied, but he lied about the wrong games. Diablo and PoE require barely any skill; you need half a brain and a shit amount of time to have a top character there. Essentially, he was bragging that he plays these games ten hours a day, every single day, for months.