Koshy, thanks for posting those YouTube videos. The shooter shows an an impressive rate of fire, and extremely solid control of the rifle - most impressive to watch. And if they didn't somehow "cheat" on the filming of it, the 100m 1/2" 5-shot group that he fired at the end of the video, at that cadence, is fantastic.
One thing that I noticed is that the shooter seemed to have an extremely "straight" orientation (of his body) to the rifle. Also, he seemed to have the butt tucked to his shoulder quite close to his neck, rather than farther out.
Still though, if you watch carefully, you will see his bipod legs move back about 3/4" every time he fires a shot. On a smooth surface such as the deck he was firing from, that does not cause a hop. But firing from grass, that would typically cause the bipod to hop up and out of position - at least that's been my experience, I have always found it necessary to re-set-up after every shot. I've only ever used a Harris bipod, I imagine that one of the "ski-type" bipods (e.g. Rempel), or one of the bipods with recoil slides, or one of the fancy feet (Versa Pod), or spiked feet, could probably help this greatly.