The advice Blanchard gives to parents of girls with rapid onset gender dysphoria is to seek to identify the issues present prior to the GD and treat these, and to delay as much as possible gender transition.
He is not saying that girls should have their breasts cut off etc. In fact, I am not even sure the Travistock Clinic is saying that.
I don’t disagree with your analysis UpABit Late; my point was really that the fastest group of trans identifying people are natal, teenage females.
Blanchard and his co-authors suggest that teenage onset dysphoria on males is AGP (excluding people who have been dysphoric from an early age).
In the context of the bra article in the OP, a PP suggested that trans identifying females would be better served by bras for people than binders, hence boys can wear bras too. I see where that view comes from, particularly if there are lots of ROGD females.
But I am not sure this was the context of the Twitter storm, the Twitter storm is about the word girl, and erasing the distinct market for girls, not making it about females who present in different ways. It is also attacking a small retailer, as others have said.
Boys do not need bras, physically speaking, unless they transition. And then the trans logic is that they are girls. So, I am confused by the whole thing.