I see, different design, and idk if I’d recommend that. Unless your water level remains constant, and even then I would drive 6x6s down and attach frame to that.
The ones I’ve done were floating with the frames having built in floatation devices along with the decking itself being buoyant.
Then how does it account for water level changes? Posts get attached to the actual dock with a larger diameter sleeve (or “U” type bracket) to allow for up and down movement with water height changes. Otherwise your dock platform would need to be set above your max flood water height, and if it wasn’t the up pressure from the dock trying to float would destroy it and cause the posts to pull up. The first few storms your dock would be under water and eventually would tear apart and float away. In that video they set it right at shore ground level.
Maybe your body of water is controlled and doesn’t allow for water level fluctuations?
If not make sure you set yours heigh enough, and then build a ramp from the shore to dock height.
It could be an entirely different system than I’ve used in the past, but as long as you follow manufacturer guidelines then any damage or design flaws that potentially could happen should be covered by them. Just read the fine print for specific requirements! I know those systems aren’t cheep!!
