I do agree that Ball's rebound rate is a positive point for him regardless of the style of the team. But you do have to question how many rebounds a league average PG would get if he replaced Ball. Probably not as many as Ball but probably more than the typical PG.
IOW, Ball is doing better than most PGs would do in that position but his numbers should be qualified a little.
Of course their rebounding would go up if their the team was gameplanning for them to get rebounds. But why would we qualify numbers for playing smart basketball? Teams gameplan for bigs to get rebounds and we don't qualify their numbers.
End of the day, it doesn't matter who got the rebound or why. It just matters that they got it.