The GOP is a private organization. It is not part of the federal government.
In the same way its platform supports life, it can say it supports privacy and security if public restrooms, locker rooms, and showers.
That doesn’t tell any state how to handle it. It simply supports a principle of privacy and security.
The platform should be short and sweet, including bathrooms suggests that a lot of other things would need to be individually listed.
The Platform represents political positions, on where we want the nation to go politically.
Why not just put the 10 commandments in the Platform and say we are for these?