Lets look closely at what is in the video.
1/ The shooter leans away from the stock and does not control recoil when using the standard bipod attachment. You can see him shrug his shoulder back away from the butt pad.
2/ When using the recoil rail the feet of the bipod are suspiciously right over a crack in the boards and don't move a fraction of an inch from that crack even though the bipod legs flex back quite a bit.
Some trickery is going on in this video.
3/ The idea is not a bad one at all and in theory could do some good but I suspect the recoil spring is too heavy for the system used.
4/ One of the potential draw backs is that if any extra slop is introduced between the bipod and the stock forend then some group accuracy will be lost even if sight picture re-acquisition speed is improved .
There was no accuracy testing comparisons going on .
5/ From what I see It may be better to have very little spring inertia to get over at all and have it operate more like using a normal forend on a bench rest stand . The spring meerly returns the bipod to battery when the weight is removed . when the weapon weight is on the bipod the shooter preloads the bipod as normal. Maybe not it's hard to say how much recoil is reduced untill you use one .
6/ The moving surfaces would need to be very precision and have low friction to move well without slop . This also increases the chance of dirt and dust jambing up the system .
7/ It's an interesting idea for sure and worth investigating further . I would be more interested in seeing if the idea can make recoil tracking more accurate for tighter groups when using a bipod .
From the grub screws along the side of the device it looks similar to a top slide on a lathe , maybe a dovetailed gib system ? Possibly maybe?
8/ If someone buys one I would like to see some photos of how it's made inside .
