I can't say I can agree with that. I wouldn't say the suspension is too soft personally, I find it over firm if anything but this is because of the high speed compression damping, which IMO is too heavy. High speed rebound damping isn't too great though as the car does have a tendency to "jump" over bumps in the road.
There is a tendency by most people to move to stiffer springing to solve too much body roll and dive/squating of the suspension. Motorcycle manufacturers went down this road in the 80s and then in the 90s they learned that damping is what it is all about not heavy springing. To this day it amazes me that motorcycle manufacturers can manage to get the suspension far more correct than car ones can despite having a much harder time of it due to the much lower ration of sprung to unsprung weight compared to a cars.
note : when I talk of high speed damping I'm not refering to vehicle speed but the speed of wheel movement. IME perfect suspension (or as close as you can get to it) is acheived with relatively soft springs, heavy (ish) low speed compression damping (this stops the car wallowing at high speed) and relatively light high speed compression and rebound damping (this combined with the soft (ish) spring) allows the car to soak up uneven road surfaces keeping the tyres stuck to the road.
edited to add - also people talk of suspension movement as if it's the nemisis of good handling. This isn't true. A car needs to dive and roll a bit to acheive maxium grip from weight transfer under cornering and braking etc
cuprablue