@Sherpa, according to all my research you are correct. The average calculated Academic Index for the recruited athlete population must be within 1 standard deviation of the average for the student body as a whole at each school. (calculated over a rolling 4 year period). Further, the minimum or floor required by the league is an AI of 176. There is no minimum GPA set by the league.
Each school and athletic department may set their own requirements, one of which may be a minimum GPA, but this is not something that is set by the Ivy League.