Is that for real? I was under the impression that Jonald was intelligent. "I don't care if Stalin is shady I like his uniform" ... holy crap 
it would only be a worry if bitmain had a exploit against bitfury or bitfury had an exploit against bitmain..
but finding that bitmain "could" only access their own products and "if" they triggered anything they would end up with queues of refunds.. its not as big a deal as say a soft fork that bypasses real network consensus, to add code that if activated changes the network into a tier network without nodes consent/veto ability