Seems like said poster ain't China's gain.That said,I reckon he's much more likely to be one of SB's detractors,of which there are thankfully only a few.I base my evaluation of P.U. on his terse criticism of SB,lumped together all in one solitary post.
By the way,PU stands for 'pulled up' in racing terminology,which is used to describe the action of a jockey stopping or slowing up his horse by pulling the reins.Maybe P.U. should apply the same principle to the vitriole he is trying to subject SB to!