There is no new Spirit Pro

There is new Spirit 2 which is successor of the original Spirit units.
Old Spirit units have one port less and still it was enough for running 800 class helicopter.
With Spirit 2 you can connect up to 3 BEC leads what is enough for the most helicopters.
For people that need 4 BEC/powering leads there is Spirit Pro

So likely it is misunderstanding in meaning of the units.