There are a number of persistent factors. They are well known in academia and to financial practitioners. There are structural reasons for their existence. We are talking about value, fama french size, etc. These are classic factors that everyone knows about.
https://www.aqr.com/Insights/Research/Journal-Article/Bettin...
https://en.wikipedia.org/wiki/Low-volatility_anomaly
I think your attitude of dismissing decades of academic research by Nobel prize winners is a little myopic.
Also I don't think you understand what "risk-adjusted" means.