So I'm not very familiar with the Domain you cited but I am aware of the Phantom Lover from the 2e Ravenloft Darklords book I own. If I can recall, he too would rape but the way I envisioned his actions were very much like the visitations of a vampire despite the fact that they would undoubtedly be more sexual in nature than that of a vampire feeding.
If someone at one's table (a player) had active trauma of a RL incident (of that nature) it would obviously be the DM who would need to not include such a common trope (Night Hag, Succubus, Rusulka...etc) in the campaign. As it would for any other story that would negatively affect their player/s.
It's not like we sanitise Greek myths right for those who would be affected by the rapes by Zeus?
The Phantom Lover was a plot device; there was almost no reason to actually bring him into your game. He was basically there to explain how Garbielle Aderre suddenly had a fully grown child.
Dementlieu (pre-revolution Paris) was ruled by Dominc d'Honaire, who had total mind control powers. He was a Parisian-style nobleman who was desperate for love, but any woman he loved would see him as hideous. He was also written, IMO, as the type of person who didn't have problems having sex with someone who didn't love him (he
was in a political marriage) and would undoubtedly use his powers to get any woman he wanted to "agree" to sleep with him.
We often
do sanitize Greek myths, and even when we don't, we don't bother to tell them from the point of view of the rape victims. It's just "there goes Zeus; wonder who he's going to rape again." It's almost a
joke. It's certainly not treated seriously.
But this is a game. It's not supposed to be ancient myth; it's something that was effectively written and run
now, not thousands of years ago and barely explored. In a
game, the actual books shouldn't include NPCs that are likely to target
my character not as a foe to be killed but as a woman to be raped. Even if the DM has no plans on ever including such a thing in their game, that sort of stuff has no place in a book being sold by a major company to an all-ages demographic.
Also, real people get raped and abused. Real people
don't get attacked by evil fae or eaten by ghouls. Most people don't get involved in actual demon-cults. There are plenty of ways to do horror without resorting to things that hurt people in real life.