There isn't one. The size of the man's fake breasts do not alter his fetish.
The crux is that these really, really daft or hopelessly naive people are now beginning to understand that a man with a fetish can call himself a transwoman and get away with it. Because people have bought the idea that there such a thing as gender identity.
And they are beginning to believe that there is a two tier thing going on. Fetishists, versus gender dysphoria-ists.
i'm not sure, at what point, it will fucking dawn on them that the definition of a woman is not a man with a fetish, or a man with gender dysphoria.
In terms of whether it's a stunt or not, I completely agree that either way, those children are being used and sexually harassed.
The only difference it might make is in terms of how swiftly they change their policies.
I bet they won't have much compunction changing them if they thought they were offending a troll. But would balk at it if they thought they were offending TRAs.