Reddit rumor: Games Workshop changed the lore of Warhammer 40K because Amazon -- which infamously ruined Tolkein with Rings of (Girl) Power -- demanded that insert a female character in power armor.
There actually is a an all-female unit of "Fighting Nuns" called the Sisters of Battle. There is already-existing lore about female fighters. But according to this rumor, Amazon said that the Sisters of Battle weren't enough, they wanted female characters in the emperor's bodyguard (the Custodes). There are additional claims/speculations that Henry Cavill may walk away from the project, which I find hard to believe, because this is his dream project. He called this "the greatest professional honor of my life." He's been playing the game and reading the novels since he was 10. He is probably the wokies' greatest weapon in this fight.