As far as I've seen the attachment points of ballistic parachutes are slightly behind the CG - presumably so that on deployment they tend to stabilise the aeroplane in a sensible attitude whilst decelerating. It also means that they will tend to suspend the aeroplane in a slightly nose-down attitude. Therefore if there WAS any wing-lift acting while suspended it will tend to be negative rather than positive.
But that's irrelevant because the steady-state airspeed of an object suspended from this kind or parachute is zero. They are not parafoils and nor do they have the rear vents seen in some round parachutes to give the parachutist a small degree of directional control. So they will behave like balloons - the airspeed will be zero other than the odd gust.
This thread is just verifying Einstein's conjecture on infinity.
PDR