Where was this claimed? Do we have any definitive confirmation of the Roswell incident anyway?
https://web.archive.org/web/20110713153629/https://www.washi...
The engineers were told that the children were rumored to have been kidnapped by Dr. Josef Mengele, the Nazi madman who, at Auschwitz and elsewhere, was known to have performed unspeakable experimental surgical procedures mostly on children, dwarfs, and twins. The engineers learned that just before the war ended, Josef Mengele made a deal with Stalin. Stalin offered Mengele an opportunity to continue work in eugenics. . . . in secret, in the Soviet Union.
Mengele held up his side of the Faustian bargain and provided Stalin with the child-size crew. . . .
And people take her seriously?