while he's on the roster, no rule about another program recruiting him ?
from what I found But might be outdated because it's from a 2012 article : >It's already an NCAA violation for a coach or university representative to make contact with a student enrolled elsewhere without written permission from the athletic director at the athlete's school.<
So if another programs official contacted EO, without permission, it's tampering.
More than likely 3rd parties were involved if Eugene didn't just decide to transfer on his own without being advised to.