Do you think trans people should let others know that they’re trans before doing the deed?

I saw a Tiktok where a girl was talking about how the guy she was hooking up with was transphobic and she was boasting about the fact that she was trans and he didn’t know.

Now I don’t condone transphobia in any way, shape or form but I think it was wrong of her not to tell him because the reality of it is that he didn’t consent to having sex with a transgender person, he consented to having sex with someone he thought was cisgender and some people have preferences to strictly sleeping with cisgender people. In my eyes, it’s like telling a vegan person that the food they’re about to eat is vegan when it’s actually not.