Bike porn

Is that actually true, or do people just think it's going to be? The consensus among testers seems to be that a disc can actually be less of a liability than a deep section wheel in a crosswind.

Perhaps the dynamics of riding a banked velodrome in high winds (with the associated angle changes from use of the banking) differ significantly to the crosswinds experienced on a road time trial? I can't say.
I have, however seen a rider blown completely off the track (from behind a derny) on a windy day when his 4 spokes caught the wind, and a rider with a front disc nearly leave an indoor track involuntarily when someone opened the double doors down the tunnel and let a draft through.

But mostly it's because you ride so close to others in bunch racing and a slight change can cause big crashes, a slight deviation for a lone TT'er might not be so disastrous?

Also disc use at club level is mainstream in TT but not so in track.