Redbug
That is true for short rotation plantations, like in the south. But this Deere machine is touted to be for hardwood forests where the rotations are 80 - 100 years. So annually the leaves fall to the ground and add nutrients. Removing the tree in the 100th year doesn't have much effect on the soil nutrient loss.
But many enviros will use this approach to try to stop all logging and tree removal.
Some say that biofuels are coming, but I don't think there is anything on the drawing board that can compete with coal. So much more energy per volume of coal than per the same volume of biomass, that moving biomass any distance at all will either make it economically impossible, or there will have to be huge amounts of taxpayers money to finance it (at a loss). IMO
I think Deere has gone the extra to at least have the equipment ready for any biomass removal (when and if that time comes).