Sure it does, it’s the sex you have biologically. The second thing you’re talking about is called gender-affirming care and is distinct from biological sex. Both “sex” and “gender” are societal concepts, but sex is descriptive whereas gender is prescriptive. You can read that to mean sex is scientifically determinable, whereas gender is meaninglessly abstract. Sex says, “assuming all your bits work, here’s how you would contribute to the reproductive process.” Gender says, “regardless of what bits you were born with but dependent on what bits people think you were born with, here’s how society will treat you and expect you to behave.” “Biological gender” doesn’t exist, just like “sociological sex” doesn’t exist. So I guess in that sense, “biological sex” doesn’t make sense, because there’s no other kind.