You speak of which you have no knowledge.
It is a mere assumption. Why would a soul ever cease to be?G-d is immortal. G-d is of infinite nature. Souls are from G-d. If G-d "creates" souls, then what are they created from? Where do they come from, and where do they go to?
It makes no sense for souls to be temporary. It is an innovation to believe that. It is a pipe dream to think that "a satan" does not end up in eternal torment of his own making. Jesus tells us so in the Gospels, but you do not hear.
Yes, I do 'hear' that Jesus teaches to be in fear of Him who can kill the soul as found at Matthew 10:28 B.
As Adam 'became' a living soul at Genesis 2:7 ( Not before mortal Adam was formed was Adam a living soul )
At his death Adam 'became' a dead soul because the 'soul that sins dies' according to Ezekiel 18:4,20.
Adam went from non-life, to life, and returned back to non-life - Genesis 3:19.
A person can Not 'return' to a place he never was before.
Sinner Satan was never offered everlasting life.
Sinner Satan is wicked and No one wicked can have eternal life anywhere.
The wicked ( angelic or physical ) are ' destroyed forever ' according to Psalms 92:7; Psalms 104:35.
The wicked will be No more according to Psalms 37:10. No future for the wicked - Psalms 37:38.
The choice at 2 Peter 3:9 is to 'repent' if one does Not want to 'perish' ( be destroyed )
Sinner Satan will never repent. There is No forgiveness for committing the unforgivable sin - Matthew 12:32
Sinner Satan is a wilful practicer of sin and there is No sacrifice for the unrepentant sinner - Hebrews 10:26