Originally Posted by
BARKINGMAD
Did you mean "reduced bank" INCREASES climb rate?
Depends what you are comparing it to. The wording is vague.
The use of half bank will reduce the climb capability compared to straight-ahead capability, but will not reduce it as much as using full bank would. So it is increased compared to full bank. (And it's probably close enough to the same change as to be not worth worrying about)