The basic problem of specific agent-created-this-universe hypotheses is that of trying to explain complexity with greater complexity without a corresponding amount of evidence.

The SA is not a new theory of physical theory that requires new evidence or fills in gaps in the current evidential record. It's more of a metaphysical revelation or model update based on consequences of the future as modeled by current theory.

For example, imagine a world consisting of just Adam and Eve on an island. They eat fruit and live a peaceful existence, learning what they can to the limits of their observations. Based on the available evidence, they assume that they spontaneously appeared out of the ocean. Sometime much later Eve becomes pregnant and gives birth to a child which begins to slowly change into something resembling it's parents.

At this point Adam and Eve have enough data to predict that they will spawn children which become likenesses of themselves, and it is also reasonable to conclude that they themselves originated from this process and have parents somewhere, rather than having crawled out of the ocean.

Our planet is 'pregnant' with a developing noosphere/technosphere which we can predict will eventually spawn many child universes very much like our own.

If our universe is a simulation developed by a computer science undergrad (from another reality) for a homework assignment, then that doesn't make them our God.

Any civilization or being powerful enough to simulate our reality is a god to us in every useful sense that the term god has ever had meaning.

Confusing future reality-simulating posthuman descendants with modern day grad students is like confusing bacterial DNA with the internet.