New Heaven and Earth- A Dwelling Place for Unrighteousness?

Duncan like so many Full Preterist say the new heavens and earth contains unrighteousness as this quote demonstrates. 2 PET. 3:13. "Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness." So I question how one can can say the EXACT opposite of what this verse clearly says in order to support their view.

Duncan McKenzie "The new heaven and earth in Revelation (and Isaiah) is not heaven. Notice, it still has unrighteous people in it, those outside the New (covenant) Jerusalem (Rev. 22:14-15). The new heaven and new earth is a symbolic representation of the post AD 70 spiritual order of this planet. The old covenant order (the old heaven and earth) flees and the new covenant order (the new heaven and earth) is established (Rev. 20:11; 21:1-2)."

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