Was re-reading the thread and I saw this, and I felt I needed to weigh in on this post. My opinion on the whole Mordred pronoun thing is similar to my opinion on most 'shipping communities'; that it's people latching onto small details that 'prove' their opinions correct rather than a reasonable standard of what is actually stated and supported as a part of the original text.
In this case, Mordred is a fairly realistic example of what would have been a medieval tomboy; that being a girl who idealises her male role models rather than her female role models (understandably, what with Morgan being a good example of what 'toxic femininity' would be in practice, if not really fitting the ideal theoretical motivations). This leads her to a mildly warped view of 'good' behaviour that emphasises traditionally masculine virtues and delegitimises traditionally feminine virtues, since they initially appear to correspond to whats viewed to be failings in men, since she never really saw the good side of traditional femininity, only it's failings. Combined with her isolation (she appears to have not had any of the Orkney siblings around when she was raised, which makes sense I doubt Gawain would have left his younger siblings alone with Morgan if at all possible) leading to stunted social skills, Mordred's character makes sense if you remember that in her experience, kindness is masking condescension and the core of traditional femininity is empathic compassion.
TDLR: Mordred views traditional femininity as weakness and a character flaw as she has only has really experienced the toxic side of femininity and idolises a masculine role model, but doesn't reject her identity. Or more simply, Tomboys aren't Trans.
While this turned into an effort post, I do think it was rewarding, at least for me.