It is not fair, no matter how much you try and suppress testosterone, you have a skeletal and muscular advantage that will not go away over night.
I equate it to being 58 years old, my test levels have obviously dropped significantly, yet I can still easily out lift the majority of women half my age, despite no longer being anywhere close to as strong as I once was.
I am all for allowing people to live as they desire, but don't manipulate that desire into a chance to compete at an unfair advantage with the opposite sex, it shouldn't even be a discussion IMO, especially when it has a negative impact on the ability of someone who has worked their whole life in a chosen sport to compete on an equal playing field.