The simplest explanation: a KS test measures a difference, it does not realize a methodology.
Realizing would mean making the operationalization tangible in full, not just a measurement step.
If we treat the interpretation of a KS test as a direct proof, we neglect crucial market conditions, such as real liquidity or exogenous shocks.
The MAS requires a complete operational understanding of mechanisms, well beyond mere distribution similarity, to validate a strategy.