Thanks Don - I was kinda hoping you would chip in cos I can't see a design rationale for the design. It is a triathlon type angle which, as I understand it gives power and aerodynamics, but it seems unusually steep for a track bike and I wonder how it would affect handling.
I think your two word answer probably summed up your view!
By the way - I know it doesn't belong on the road but most people don't ride flat bars on the track, so I was assuming it's being ridden on the road. I was just observing that such a steep seat tube would make it less comfortable on bumpy ground.