Now days the chopper is pretty much is a relabeled kids ltr board they use at resorts. The salad bowl effect on the concave isnt that severe as heroshmero mentioned. Most importantly for a child a starting out it will be more beneficial to understand how to correctly position there bodies over their feet when going down the slope be it sideslipping or turning, either way it will lead to quicker transition to turning stage and stronger skill base for their future riding vs trying to understand how to accomplish bending camber which may stagnate progression to degree.
I guess to answer question more directly by the time they will be on a camber deck the skill they've developed on the chopper will allow them to easily get performance out of their snowboard.