Force Shroud gives you 100% protection against the "death by healing" phenomenon. When I run with shadow tanks in this fight, I usually tell them to pop it as soon as Force Leech lands, just to cover healing mistakes. It also gives them time to click off HoTs and what-not.
The problem with using Force Cloak is the cooldown is too long to use at every Force Leech, whereas Force Shroud will always be up.
Didn't know that, good to know.
However it's still an additional cooldown for this fight.