Course with that said, I can really only see one cable going into the top rear machine in that one video, which is probably the power cord.
Anyone with an S4/S4+ can verify 1500 wall watts can be cleared by two sets of 120mm push/pull fans. The real crime with this design is the PSU cooling. Top venting? Really? Gross. I doubt it's a serious product as much for that reason as for their outrageous efficiency claims. I'll be impressed if this thing is a real miner. At least they're learning to build the box instead of trying to sell renders, but when will scammers learn a more realistic product with a more realistic price will get them more sales? Claim to be 20-40% better than current tech and you might convince more people.