Kinda.
When people say Valkyries are associated with nazis is because legend says that Hitler used to listen to Wagner's "Ride of the Valkyries" while hearing reports about London's bombing. But this always felt like tall tale by historians trying to sell more Hitler books, the man alone keeps a whole class of historians fed.
Now, about Robert making Valkyries being "oedipal Barbie crushes" for "nazis" I have no fucking idea what this idiot is talking about. People don't give a fuck about Valkyries, be the Maidens from the norse mythos, or the D-lister Marvel character who was a minor character in fucking Thor, the lamest avenger, and the Avengers were always lame by default, the shitty Justice League.
I know what Robert is gloating about, that back in the first Thor movie, there was some blowback over one of the norse gods being black, but by the time the third movie rolled in and the new valkyrie was black, no one gave a fuck, the same way no one gave a fuck when the character was said to be gay, or bi I don't give a shit.
And this on Robert's books seems to be a big win, hey who cares if Marvel movies reduce our culture to puerile pastiche, but at least when younger people think of Valkyries, they will think of strong black women, that will teach the nazis.
Sure Robert, whatever, you win, really hope this whole culture war thing pays off for you.