They have no legal authority to implement that. The ncaa cannot tell a player they have to sit a year because they didn’t transfer within their defined window. Because they really have no authority to assign a defined window for transfer to begin withThis does not prevent a player who wants to leave from leaving for another school at any time. They would just have to wait a year like they use to do.
To me this is more like - if you want to play for another school in the coming year, you must declare and move in a specific period or wait.
Like I said, if this impedes a player in any way, it will be challenged in court and the player will win