mianzhu, 7-dan - new KGS star with 10-0 score

Chinese player "Mianzhu" started as 2d? and reached 7-dan with the perfect 10-0 score. He won all his games by resignation, including four 6-dans.
What do you think about his level? He is stronger than regular 6-7 dan, it seems.
Which rank can he reach on KGS?

My opinion: he is not a professional and will start losing games on 8-dan level. It will be hard for him to get KGS 9-dan rank.