looks like bs to me.
also do the calculations - 900H/s = 5*rx480, 120W*5 = 600W, 250$*5 = 1250$...
WHY?

A single Radeon Pro Duo produce 1000 H/s and uses 300W
It cost about 1200 USD here in Denmark
Guys don't forget cost for PSU, CPU, RAM, MOBO, RISERS, CASE
This Zcash-Equinox is not a bad start for someone that has no idea regarding mining
It has other problems sure but the ratio Hashing/Cost is not far from a RIG with x5 480's