Back on topic, all I said about Bitfury is that no one has actually ever tested their miners who is able to speak about it, and so its hard to really take their repeated claims seriously. If you think I'm paid for PR, why don't you talk to Bitfury's actual PR company or their Head of Global PR.
Well, I actually did watch the whole testing process very closely and can confirm that 28nm figure to be empirically derived
(I hope my word still has some value on these forums)