We have been conditioned to associate feeling dysphoria with being 'trans'; to the extent that dysphoric feelings towards the body is a foolproof indicator that someone is trans
Totally agree. Combined with a belief in gender identity, this is what's helping so many adolescent girls in particular conclude (incorrectly) that they aren't girls after all.
However, I just wanted to add a bit of balance that there are people for whom gender identity is real (I'm not one of them) and because of the combination of their belief and the distress at their body, what they feel is "gender dysphoria".
It remains to be seen whether the public believes Anne is one of them or is they think Anne is Isla Bryson of the swimming world. There are many more Isla Brysons of many more worlds, of course.