If we explore "Travelog of Mr.Fong": Volume 10(superscript th), it is rather exaggerated to say "disguise or deceit" but just a game of scholars, nor a revenge from hatred.

仔细探究《见记》卷十“李邕”条，“作伪相诳之”略为夸大，应以文人游戏看待，怀恨报复。