The passage this snippet of a verse is pulled from is talking about God destroying the earth in judgement. People are mocking saying, where is the promise of His coming? But the present world is being reserved for judgment.
A lot of folks think that, for some reason, Peter just jumps to a universal soteriological statement. Just 'cause. However, that's not true.
8 But do not let this one fact escape your notice, beloved, that with the Lord one day is like a thousand years, and a thousand years like one day.
9 The Lord is not slow about His promise, as some count slowness, but is patient toward you, not wishing for any to perish but for all to come to repentance. (2 Peter 3:8, NASB)
In other words, don't worry about the mockers. God's timing is His timing. He's not slow about His promise to destroy, but is patient towards you, believers, and not wanting any of the elect to perish but come to repentance.
And then he continues on about Christ's coming.
Trying to make two verses soteriological in the middle of a passage about the end times makes no sense whatsoever.
That is, unless you are trying to make it say something to doesn't in order to bolster a position.