Normally, use of Wings of Heaven is limited to a certain number of uses per day. The lvl 20 Celestial bloodline power, among other things, removes that limit. So you have no limit on the number of times you can use the ability per day. That isn't the same as granting you the capacity to use the ability. Another way to look at it: there is no limit to the number of times per day you can use Power Attack. Technically, every character has an unlimited number of uses for the Power Attack feat. But you need the actual feat to have the capacity to use Power Attack. So losing the power because of an archetype renders that clause in the lvl 20 power moot; it removes the limit of an ability that you lack the capacity to use anyway.
Now, if you want to create a houserule, you might say that you gain unlimited uses of whatever power Wings of Heaven was replaced by, but, personally, I think that's stepping beyond the intent since Ascension is meant to be an ultimate expression of the Celestial bloodline; but, because of the Razmiran Priest archetype, you explored other avenues rather than your bloodline so "perfection" of your bloodline for the parts you did pursue wouldn't necessarily extend to realization of powers you've ignored in favor of alternate routes of power.