Spring and damping are diffferent things that work in different ways to achieve different results. Definitely you could play a bit with both, but not to the point where you run "more damping and less spring" to achieve the same firmness or whatever. His suspension is just perfectly setup for his riding style, hence the smooth look.
Also keep in mind these guys are riding mind blowing speeds in very rough terrain (even Les Gets you might think it's smooth grass, it's not, watch slow mo). Their suspension is probably hard AF compared to an average person to deal with those hits.