QT-A Prophecy Against the King of Tyre

Ezekiel 28:19, NIV
MM
Pride goes before a fall..remember this from Proverbs. God’s judgment of Tyre for its pride…want to compare itself to God..also a parable of Satan’s fall because it wants to be God…Because you think you are wise, as wise as a god, I am going to bring foreigners against you..vs 6-7…you will be but a man, not a god..vs 9.
Likewise, Satan prides itself for his beauty, wisdom..and wants yo be God…” You werethe model of perfection, full of wisdom and perfect in beauty. You were in Eden, the garden of God; every precious stone adorned you: riby, topaz, emerald….created…anoited as a guardian cherub..vs 12-19.
You were blameless in your ways from the day you were created till wickedness was found in you..you were filled with violence and you sinned…God’s punishment on Satan vs 15-19.
Also to read Isaiah 14.
Mystery question: why God did not destroy Satan once and for all after its fall? Is there some form of agreement or covenant?