Harry has avoided a number of Apolcalypses so a Harry who didn’t has likely doomed his world, Red Court Rampant, White Council destroyed, white Court on the rampage under Raith, the Fae Courts out of balance and at War, Nicky’s plague running rampant a Kemmlerite god on the rampage together with a Titan. The outer Gates in direct peril. This world is dying, and if it falls to the Outsiders then the multiverse is in peril. Uriel may therefore prune this reality any time soon. It is in its endgame early and losing. That is what I think is mean’t by that quote, it’s a wonderful life moment for Harry.