I knew the Dunning-Kruger effect wasn't valid, but thanks to this post I finally understand why: "The Dunning-Kruger Effect is Autocorrelation"
https://economicsfromthetopdown.com/2022/04/08/the-dunning-kruger-effect-is-autocorrelation/
The Dunning-Kruger Effect is Autocorrelation – Economics from the Top Down

Do unskilled people actually underestimate their incompetence?

Economics from the Top Down
@joeposaurus The top of this absurdity is the fact, that Nuhfer et al use a invalid measure of "skill". Education level is not a valid measure of skill. This is not proving the invalidity of an effect – it's proving the invalidity of the writer and the authors of this study. The invalidity of the paper by Dunning & Kruger does not prove the absence of the effect.