That isn't how it works. The T limit is for all women. There are lots of cisgender women out there with physical differences that give them higher than average T. 

If you learned about transgender women, you would find out that they tend to have lower than average T, especially after surgery. In women, T is produced at least partly in the ovaries. Trans women don't have those, so they don't get as high of T levels. And before surgery, they take drugs to block testosterone, and those along with E often reduce T to lower than average levels.

Besides, the idea that all women have average T levels is a complete falsehood. The average exists because women (yes all of them) are all over the map. The limit exists for that reason too. 

Either way, if you want to address the T limit in sports, be prepared to kick a lot of cisgender women out too, because that is what you would be doing.