What is your source for Milgram (and Stanford) not being replicated? As far as I can see, it was, in Burger, Jerry M. (2008) “Replicating Milgram: Would People Still Obey Today?” for example, but also in many different experiments.
I can’t really find any sources for the experiment being performed wrongly or disproved or anything. Of course, it’s hard to replicate them with current ethical standards being in place, but that’s the only thing I could find, not that the experiments themselves weren’t valid.