Whereas the only power satan has is to destroy
Not really. In Job, we see that Satan had the power to create a wind strong enough to collapse a building where ALL of Job's children were attending, and were killed. And Satan killed ALL of Job's cattle, etc, basically all his wealth.
And then, Satan had the power over physiology, to give Job the worst case ever of full body shingles, possibly. Or at least, full body boils.
God has both the power to create (and I mean in the sense 'out of nothing' rather than manipulating what God has already created) and destroy and it isn't beyond God's character to destroy what He had created.
I have no doubt that God is able to create ex nihilio (out of nothing) and to vaporize whatever He wants. The Bible SAYS He is able to destroy. OK.
But, the only real question is, does the Bible plainly give evidence that He does or will cause souls to cease to exist?
I find evidence to the contrary. That unbelievers (conscious souls) will experience eternal punishment, in Matt 25:46. And that unbelievers will be tormented day and night for ever and ever in Rev 20:10.
I find these 2 related verses to be iron clad.