"Hooey was a member of the Saint Mary's Huskies during the 2008 football season. Mr. Hooey transferred to York University intending to enrol in a graduate program, which would make him eligible to play for the York Lions in 2009 under CIS Rule 126.96.36.199.1. Mr. Hooey, however, opted to enrol as a full-time undergraduate student, making him ineligible for 2009.
"... The matter remains under review by CIS which has the option to impose further sanctions."
It could be a honest mistake. There's nothing to be gained from a school flouting the rules.
York football self-discloses ineligible player (press release)