Wamu
whats-a-matta-u?
Wrong, it can be appealed.
If the school wishes to avoid the NCAA penalties imposed on that coach, the college must send representatives to appear before the NCAA's Committee on Infractions, and "show cause" (i.e., evidence) as to why it should not be penalized for hiring that coach.
Nebraska can possibly do it because of the perception that Nebraska is a relatively clean program.
Bruce Pearl was under show cause and was hired by AUBURN.
Just because Pearl was cleared by the NCAA doesn't mean Tressel would though. You have a good point though.