This is not useful at all !
Simply jump start one PSU, plug the PCIe on the graphic cards and turn it in, then with the second one plug everything in the mobo/cpu/cards and turn on the computer with the on off switch, they will magically turn on at the same time (well actually PSU2 witch is jump started will be on, but won't pull current to the gpus as they're not turned on from the mobo)
Have fun
I would tend to kinda agree with a big feature they brag about "Redundant power supply architecture concept". Redundant is nice.... but that mean's I have a extra PSU sitting there incase one goes down. So higher cost by buying two PSU's.
Just not enough PCIe cables for running a BTC asic with 2 coming out of it. You would be using some PCIe off PSU's still I would guess which defeats it's purpose again. Also if looking at Ether rig again only to PCIe cables... so I think just not enough for miners. It's more for someone wanting redundant power on a single GPU machine.