I read it again and CBE expert says:
"You ignore the loading property of the Hand crossbow, heavy crossbow and light crossbow (...)."
So I ignore the loading property that would otherwise limit me to one attack per round.
"If you are holding one of them, you can load a piece of ammunition into it even if you lack a free hand."
So I do not need a second free hand. Ergo: Dual hand-crossbow-party-time!