I don't have anything for this season, but Bradley Beal had the fewest points per game with 30.0+ points per game in 2020-21, with 31.3 per game.

who is the shortest player to average 30 points per game
Interpreted as:
Who is the shortest player to average 30 or higher points per game this regular season?
Bradley BealBradley Beal2020-21WASWAS6031.335.,1471,8782832656922187140-3
Stephen CurryStephen Curry2020-21GSWGSW6332.,1522,015345363778213119+242