Considering your first qualification, perhaps we just differ on terminology. If Coach #1 makes a recruiting commitment, subsequently leaves his/her position, is replaced by Coach #2, who cancels Coach #1’s recruiting decisions, then the coach who issued the recruiting offer did not renege on his/her commitment. Coach #2 never made the original commitment, so also did not “renege” on the offer.
I concede (we don’t have to agree to disagree!) that premed is a prime exception and imagine that premed at pretty much any school is a challenge to continuing ncaa training and competition.