Why do you assume that not mentioning trans rights in speeches = not supporting trans rights?
The point is that in order to win elections you campaign on things that your opponent can't use to alienate some of your base. I'm going to be blunt here but not all Democrats are progressive enough to see trans right as something important and some of them don't want a "woke" president (as the term "woke" was appropriated by the right as being a bad thing and supporting trans rights is woke) so mentioning them directly during the campaign would make more people not vote/switch back to voting for the Republicans than it will make trans people come out and vote because trans people already know they only have one party that supports their right to exist, even if it's not being campaigned on.
Why do you assume that not mentioning trans rights in speeches = not supporting trans rights?
The point is that in order to win elections you campaign on things that your opponent can't use to alienate some of your base. I'm going to be blunt here but not all Democrats are progressive enough to see trans right as something important and some of them don't want a "woke" president (as the term "woke" was appropriated by the right as being a bad thing and supporting trans rights is woke) so mentioning them directly during the campaign would make more people not vote/switch back to voting for the Republicans than it will make trans people come out and vote because trans people already know they only have one party that supports their right to exist, even if it's not being campaigned on.