This goes into what “existing” means and that is a philosophical rabbit hole that I’d rather not go into right now. What I can say is that: to me fields on a spacetime (of the “Particle from Nothingness” case) stand at the same level of “existing” as the wave function of the universe on a superspace. If you think fields on spacetimes “exists” in reality, then so does O on a superspace.
Technically I am a religious apologist, just not that kind.