With all due respect, who's interrogating ACDC for their "implicit whiteness"? Led Zep has gotten some flack, but that's less about them being white and playing blues riffs and more about them stealing songs ( for what it's worth, they did it to white musicians as well). Both bands have been criticized for being sexist, but that has nothing to do with post-modernism, they've literally had those criticisms since their earliest albums (45-50 yrs ago).