The individual that supplied the $ to the Bush family, Lloyd Lake, has no connection to USC. Lake was a wannabe sports agent that used the funds in attempt to secure his spot as an agent for Reggie when he went pro.
This is why the allegations in this are so flimsy, what Reggie knew of his parents dealings with Lake are unclear. But in the eyes of the NCAA it was on Reggie to police his parents and also on USC to police the Bush family’s dealings. The entire thing was selective enforcement.