X-mode enhances traction
X-mode enhances traction control and remaps transmission out put. Traction control uses clutching to both front and rear differentials and applies braking to spinning wheels, which will bleed out power if not done so. I've read x-mode applies more power to rear wheels than otherwise done AND the difference between the snow and deep snow is deep gets lower gearing through the transmission than plane snow.
I've had to read a number of articles and watch numerous videos because no, one article has explained it exactly so far!