Is that where this happened? [Isaiah 14:16-17] Is this the man that made the earth to tremble, that did shake kingdoms; That made the world as a wilderness, and destroyed the cities thereof.
I’m confused as to why this is confusing you. That question is being asked after Satan is finally defeated, or I should say when his defeat is manifested (he is presently defeated and earth has been redeemed from his hand, though the redemption has not been manifested). That passage is prophetically talking to Satan about his eventual imprisonment while calling to remembrance his fall from Heaven.