The heavier weights you give are for pursuit bikes (presumably with disc wheels) Only have to be accelerated once on a smooth surface. Obviously aerodynamics are going to be more important than weight on a pursuit bike. It would be interesting to contrast the weight of the the srpinters bikes with the pursuit bikes.
Also, this really is an apples to oranges comparison. Track racing at least sprinting is about big guys producing incredible power. Marty Nothstein had to lose at least 40 pounds when he went from track sprinting to doing criterium races. I bet you Marty's crit bike weighs somewhere close to the UCI limit.