The whole rollout for 0-60 thing is a big fuss in the car magazine subculture - instead of counting zero to 60 from a standstill, they now count zero to 60 in a drag race style, where you have to trip the starting light by going forward a foot or two.
What that most likely means is that the fastest model doesn't have enough grip to keep the tires from spinning off the line, so they are basically spinning the tires for a fraction of a second (or longer) and then once they start to move forward, they start counting the 0-60 time. I imagine if you did the same for the cheaper model, it's 0-60 time would look better as well.