i think one of the factor that makes hes calculation wrong is the very agresive OC, the 1070 neoscrypt is 1100 while user in real scenario users will reduce the power limit upto 75-80% making it at 850+ only.
That's false. GTX 1070 at 1700MHz and 0.8V core voltage does about 1100MH/s with KlausT's ccminer and 1170MH/s with hsrminer.