It looks like a good PSU, but it only has 18 pairs of outputs which would only give you 3 full pcie connectors and you would need to install the plugs yourself.  The wires look like 14ga wire so I suspect they are expecting users to only use one pair for each PCIE plug--2 pins per 6 pin plug.  Even this approach would only power a single S7 or S9.  I have seen several S7s catch fire with this approach so I wouldn't recommend it.  At least some versions of the S7 don't have thick enough input power traces to handle this much current on a subset of traces and overheat.  You could probably make a custom breakout wire harness to split the current out to all the pins but that would be a lot of work.  They do mention they are adding a version with 16 pcie plugs which would save some manual labor, however, the issues noted don't go away.

I plan to stick with the DPS-4KWs.