the IRS has a policy that you cannot deduct loses on a worthless security until it is totally worthless. Delisting does not mean this.
delisted securities can still have value and trade in any of several OTC markets.
see the thread
https://robbinsllp.com/my-stock-was-delisted/#:~:text=Once%20a%20stock%20is%20delisted%2C%20stockhol...
