That's a great article from the Guardian. I thought it was balanced. They had comment from the transgirls saying how they felt, that's fine, it really showed up how they don't see the problem with being teenage male bodied and winning the girl's race. The photo of them racing makes it clear what's going on.
I liked this quote from a lobby group about why transgirls should be allowed in the girl's race:
The idea that the law only protects the individuals with XX chromosomes as compared to individuals with XY chromosomes is found nowhere in the legislative history of Title IX, in any implementing regulation or in any other aspect of the interpretation of Title IX over the last 50 years by the courts
If anyone were in any doubt that this is about lobbying to let men race in women only events, that spells it out. Everyone on the planet knows men have physical advantage over women even if some have a vested interest in pretending that's not true.