I am referring to them, yes. After all, nobody else exists, so there's no one else to refer to really.
Although Marianne Williamson (maybe the distant #3 alternative candidate) is generally antivax since she's from the older group of naturalistic-fallacy hippie women where the idea originally caught on.
RFK and Desantis are doing it because the vaccine was a major policy accomplishment of both the last two presidents, ie the party leaders they're running against. It may seem like a natural political opportunity but it's a bad move since normal voters don't like crazy people.