No, you clearly are not following.
A player can move from scholarship to a walk on, BUT THEY MUST PAY THEIR OWN WAY WITHOUT AN ACADEMIC SCHOLARSHIP.
A player can also move from an athletic scholarship to an academic scholarship (which is guaranteed under Athlete BOR), however, THEY CANNOT REMAIN ON THE TEAM.
The ONLY way to accomplish what you are suggesting is for a player to move to a walk on and pay their own way. The player could sign a NIL deal to pay him enough to cover the cost of tuition and other college expenses, but the school can provide them with no scholarship,