No. Trans people aren’t marginalising female athletes…. Female athletes are marginalised by sexist structures and funding disparity.
Some female athletes believe that having women who were born male compete in their sports gives those trans athletes an unfair advantage. The science is mixed and still being done. Those people are already within a marginalised group and some believe it is an attempt to further subdue their sporting achievements.
Trans athletes don’t see it like that - and the two groups are caught in ideological warfare, the answers to which are not simple.