These cars, with skinny tires, low horsepower, and no limited slip differentials appear to do just astounding.
Without all the detail, my Range Rover owner's manual did say that for muddy roads, wide high flotation tires were not a good idea. A narrow tire will sink through the upper layer of water and slush, and hit more solid ground and get traction. A wide tire, won't sink through the upper layer or water and slush and will just spin.