Take this with a grain of salt as my opinions are based on pictures and I've never skied or even held one of these boots.
Plateless or not, looks a lot thicker than my even Reflex boot with a plate and a thin liner. 6mm screws or roughly 1/4" is a big screw so in a perfect world, it will be plenty in pure tension when the load is shared. As an engineer who recognizes we don't live in a perfect world, the boot will never be in pure tension and the bending or rocking will ultimately be the death of it in my mind. This is where wakeboard binding have a HUGE advantage over ski boots. Wakeboard boots have a very wide footprint to resist rocking. Waterski boots do not.
Just for the record, landings on wakeboards do not really stress the mounting screws that much as they're only in shear from the stopping/sliding forces. Now catching the front or back edge on a wakeboard is very close to pure tension and at 30mph crossing the wake, it can be pretty harsh and I've seen a few wakeboard bindings tear out this way but not many. However, the really bad falls where the wakeboarder catches their front edge at speed (more like a waterski OTF) are the really violent crashes that usually tear out one insert and snap the binding on the other side.
Best of luck to HO and thanks for continuing to progress the sport and try new ideas but I feel like this one needs some more work.