That's more or less what I'm saying.
I'm not totally sold on the idea an Ancients Paladin should have to kill every vampire spawn, given how the game does seem to make it clear they aren't necessarily even evil when freed, but that's also kind of beside the point.
Whether you agree with that or not, it's extremely annoying to have the game make it clear for 2 acts that actually, it's okay to be buds with vampires as long as they're not doing active harm- then suddenly punish you for applying exactly the same standard you have been applying to Astarion to people that aren't in your party.