It's the Percy Jackson godhood situation. Basically belief makes it reality.
Gaslighting for fun and profit
Cauldron
knows that they are the only possible saviors of all of mankind on hundreds of parallel worlds. They have the strongest capes, the greatest thinkers, the most resources, and the divine right and responsibility to act for The Greater Good.
Obviously, it doesn't make sense for a cape like Apeiron to surpass them in any way.
BUT there are indications that Apeiron and various other members of his group are Case 53s.
Additionally, at least two members of the group, Lethe and Kataklyzein, demonstrate powerful stranger abilities capable of affecting perception and memories as well as recordings.
Thus Cauldron might have been responsible for the creation of the "Apeiron Cluster" but not remember it nor have any surviving records.
Obviously, the more powerful Apeiron and his team are, the more likely that Cauldron was responsible for their origin.
In effect, Apeiron is proof that Cauldron's efforts are succeeding .
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Meanwhile Doormaker and The Clairvoyant are just relieved that their impulsive "special purchases" have been dismissed as proof of Project Apeiron.
"The human brain is a complex organ with the wonderful power of enabling man to find reasons for continuing to believe whatever it is that he wants to believe."
-Voltaire
