I get it!
On the inside, as a person, Nikki identifies as non-binary, which means neither female nor male, and uses "them/they". OK so far...
On the outside, physically, Nikki identifies as a female track and field athlete, and thus should be pronounced with "she/her" in that capacity.
I think she/they should spearhead (oops, a phallic symbolism) the formation of a "trans category" in athletics, maybe it should even include woke people and male feminists, complete with bathrooms...