Falsification is not a core requirement of developing efficient theories through the scientific method.

The goal is the simplest theory that fits all the data. We've had that theory for a while in terms of physics, much of what we are concerned with now is working through all the derived implications and future predictions.

Incidentally, there are several mechanisms by which we should be able to positively prove SA-theism by around the time we reach Singularity, and it could conceivably be falsified by then if large-scale simulation is shown to be somehow impossible.