From what I understand of Joyce's position on pronouns, she is willing to use requested pronouns in most personal interactions, and in some interactions that refer to a trans person in third person, but not where she believes this would be potentially harmful. Examples include using cross-sex pronouns for prepubescent children, because there is strong evidence (supported by recent findings) that social transition, or encouraging a child to believe that their feelings or gender expression make them a boy or a girl, consolidates cross-sex identity or dysphoria that would otherwise have resolved, and increases the likelihood of wanting future medical intervention.
With regard to adolescent another groups she sees as vulnerable, adolescent girls (especially those who are same-sex attracted or have mental health problems) she appeared to be saying that it is potentially harmful to use cross-sex pronouns in public discussions about people who are role-models for this groups such as Elliot Page. This is because she believes that many girls in these groups are identifying as transgender due to social contagion and having medical procedures that they would not otherwise have wanted or might later regret.
That is my understanding of her position unless she changed it recently.
In relation to the second point, it is interesting that the
article I linked to cited research finding that "The most frequently reported reason for detransitioning by both sexes was that their personal definition of male and female had changed so that they became more comfortable identifying with their birth sex (60%)".
