Ted Bundy was an expert at manipulation and making others believe him for his own gain/amusement. Can Satan renounce his position and be saved? No, hes too far gone.
He’s dead. ;-)
But if what he said was true, I believe he is written in the book of life. But if he was, as you point out, lying and just maniuplating others for his own gain/amusement, then he is not.
But it is between him and God.
Just like Jefferey Dahmer.