For all of the tests and rebuttals of the Dunning-Kruger effect the people tested are not drawing from the totality of other people, but trying to compare thems

For all of the tests and rebuttals of the Dunning-Kruger effect the people tested are not drawing from the totality of other people, but trying to compare themselves solely to those who also took the same test. Anyone in a position to take such a test is almost guaranteed to be above average compared to the general population (which includes babies for intellectual tests, or the extremely old for attractiveness tests). I think this complicates personal evaluation.