Sports Illustrated is reporting that Memphis could be subject to a major infractions case for knowlingly playing Wiseman when he was likely ineligible. Their playing him after being warned would be seen as an aggravating circumstance.
So Wiseman sitting out 12 games is just his penalty for playing while ineligible for receiving impermissable benefits.
Have to see if NCAA moves forward and announces an infractions case against Memphis. That is where a possible post-season ban or other penalties would come into play.
https://www.si.com/college/2019/11/20/james-wiseman-ineligible-ruling-ncaa-memphis-penny-hardaway