Nah, let's look at their exposure apart from the bit which they retain (32%, I think; which I guess doesn't need to be hedged, as it's not really live).Wouldn't CS be selling vol as a hedge to their XIV?
They sell XIV to the end investor. End investor ends up short vol, whereas CS ends up long and then they hedge it by selling vol. So at a given point in time, their portfolio is short XIV and short VIX (in some way). When VIX moves a little bit higher, they are indifferent, as they're hedged. However, if VIX goes up bigly, the probability of XIV disappearing into thin air goes up, which means that, on aggregate, they get shorter and shorter vol as they get closer to the barrier. When XIV disappears, they're just left with their short VIX hedge.
EDIT: Obviously, this is just my understanding and I could be (and often am) wrong.
Last edited: