Yep. Imagine calling a high school senior, telling them you were the admissions officer of school X, and that while an email or portal update will follow shortly you personally wanted to call to congratulate and welcome them to the Class of '29. And then 10 seconds later say, just kidding.
One guy on ESPN Radio this morning was saying that a good counter-prank would be for the dad to come home today and inform the son that the organization is taking this very seriously and feels this phone number leak damages their relationships with players and agents going forward, and that therefore the dad has been from his job as defensive coordinator. Let the son stew on those consequences to the family until the next morning.