Assume you mean New York flat out released him...
Packers have $40M dead cap hit this year on books, nothing carries over to 2024.... nothing Packers due now impacts Jets salary cap.
The dead cap accelerates to a current cap hit if they released him, meaning they'd have to free up cap to release him. If he retired you'd arbitrage the signing bonus (still gets accelerated) and future year base salary + option/roster bonus is waived.