Effectively Lindy answers the age-old meta-questions: Who will judge the expert? Who will guard the guard? (Quis custodiet ipsos custodes?) Who will judge the judges? Well, survival will. For time operates through skin in the game. Things that have survived are hinting to us ex post that they have some robustness—conditional on their being exposed to harm. For without skin in the game, via exposure to reality, the mechanism of fragility is disrupted: things may survive for no reason for a while, at some scale, then ultimately collapse, causing a lot of collateral harm.
