Are you just making this up? What trans women say they experience period pain?
Trans women taking estrogen can experience PMS symptoms, particularly those with estrogen sensitivities.
However, those claiming to experience period pains may be experiencing phantom-pain associated with a strong connection to female genitalia. Otherwise, I have literally never heard trans women talking about this.
In fact, I have no idea why you even decided to make this post unless you're wanting to spread some terfy rhetoric. weird if you ask me.