Even if we take that WoG as truth for canon-Dresden Files, it can't be true for an Exalted Crossover.
The very existance of our Exaltation means that at some point in the past an impossible superweapon designed to defeat the unimaginably powerful but not trule omnipotent Titans of old.
We have enough hints, like the Neverborn name and our memory of Raksha, that a situation at least vaguely similar to Creation in the Exalted-setting once existed.
So even if God is the big cheese now, there must have been a time when all was Chaos until the Priomordials invented stuff like Causality and Existance.
The exaltations were made by Autochthon and given specific shape by higher order gods. Without the leverage provided by that the primordials were effectively unbeatable and unchallengeable outside of their peers.
See Theion wearing a crown of shattered universes just to flex.
Sure you could say it's just a matter of having enough essence and refined control of shaping it, but note that no one gains that save through them or their creations in the entire cosmos. Including the atemporal nonsense of the wyld. Being able to do what they, the exalted, and to an extend the gods did with essence could be a function of the metaphysical component found in primordial's "biology" that is grafted to exalts.
In this paradigm what Autobot did would be less making super swords and more peeling shadows off the wall and attaching them to their own lanterns. Or at least giving them to the tiny bit of mortal that isn't a shadow on a wall.
Then the metaphor breaks down when the exalts start growing into "3D" space as horrifying monsters and kill/mutilate all of autobot's siblings.
Especially in the case of infernals, for whom growing up to be something outside the mortal babysitting room seems to be a design goal.
It'd also provide a neat explanation for why they can't be lessened but exalts and primordials can be other than "because no".
They're self contained emanations of their own reality; lensed through things that they choose to take on but separate from the everything else. Trying to screw with them is like trying to turn off a lantern by running shadows over it cast by a campfire.
Which adds some pretty amazing fluff to just how goddamn freaky a mad scientist Autobot was.
All of this is very speculative, but I think it fits together neatly without contradicting anything from either side. Getting from there to here is a mystery. Could be that a new titan did rise up after the others weren't breathing down reality's neck. Could be that something Gaia survived and this is her take two.
Maybe the things in the projection booth are something like powerful shaped Rakasha bound to fragments of creation's history, at odds with their peers Outside because they've been changed so much they can't exist in the pure wyld anymore.* Any number of things would fit.
The system did shit a brick and die before getting reformatted, so there's plenty of space for all the always-have entities of the Dresden Files to actually have an asterisk point towards "in this time zone" in their background.
* Which would also make the DF!fey a pretty funny joke on their part, so I kind of favor this one.
