Public parks are public, generally for use by members of the public for such legal activities as they see fit. It is not obvious that AR games are intrinsically harmful to the point that they need baning or restriction, or that the horrors that the Milwaukee Board of Supervisors listed in its various WHEREASes justify the badly thought out ordinance they passed. It also is not obvious that the Supervisors, as a group, are very well suited to decide the park's intended purpose.
It also may be noted that neither the Texas Rope 'Em game and, as near as I can tell, Pokemon Go is a group activity, although it is plain that either may be played by many people concurrently and in the same general location.
Biting the hand that feeds IT
