No idea who Joss Prior is or why they are spamming that Twitter thread but reading their interaction with one person re Karen White Joss appears to lack cognitive reasoning skills. If, as Joss asserts, TWAW and on the back of Self-ID if you say you are a woman you are one then the only prison they can be placed into is a prison for women.
Yes, the Prison Service have fucked up in this particular case as they have acted in advance of legislation BUT the natural outcome of Self-ID and the TWAW mantra is exactly what happened with Karen White. Safeguarding is now a dirty word.