As Helen Joyce writes in Chapter 7 ("She Who Must Not Be Named") of her excellent book Trans: When Ideology Meets Reality:
In its erasure of sex categories, gender-identity ideology seeks to change not just the present, but the past, too. Any woman who, by force, luck or guile, succeeded in transcending societal strictures on her sex is now at risk of being retroactively transitioned. Boudicca and Joan of Arc are both often described as transmen. So is the Pharaoh Hatshepsut (who ‘was assigned female at birth but intermittently dressed and ruled as a King’, according to Amnesty UK). In 2019 the Washington Post removed mention of Jennie Hodgers, who cross-dressed in order to fight in the American Civil War, from a podcast entitled ‘Women who won wars’. In an apology, it said Hodgers’s inclusion had not been ‘in keeping with Washington Post style, which states that people should be referred to by their current identity’.
Lesbian icons are now routinely described as transmen, among them Radclyffe Hall, the author of The Well of Loneliness, a tragic story of Sapphic love, and Stormé DeLarverie, a professional drag king who was in the thick of the Stonewall riots that launched the modern gay-rights movement. Even fictional characters are not safe. George of Enid Blyton’s Famous Five books, a girl who hates dresses and long hair, and loves sailing and climbing; Jo of Little Women, who whistles, walks with her hands behind her back and promises her father to be the ‘man of the house’ while he is away at war; and Yentl, who cross-dresses to be allowed to study the Talmud: all are now often ‘reinterpreted’ as transmen.
(Apologies for the long quote and not indenting it for clarity. Is it possible to use blockquote on Mumsnet?!)