The T is in direct opposition to the LGB. The T says genitals are irrelevant. It's gender identity that is fundamental.
If you believe that, then homosexuality doesn't exist. Because if lesbians are attracted to women they have to be attracted to women who have male bodies as much they are to women with female ones. They can't specify which they exclude from their pool of potential partners.
It really is as simple as that. Trans ideology is homophobia on steroids.