Point is without factual context its all speculation based on personal perspective, a lot can change over a decade especially the circumstances of her entanglement, like why didn't he just truly enthralled her completely, then there would be no evidence of his tampering otherwise, he had a decade after all. Just because he showed you this scene, in response to you openly vilifying him for his appearance no less, is just as much a threat and a confirmation of the player's choice of bias. I'm not convinced until someone unveils the emperor's evil master plan for world domination which hasn't happened yet.
Lying about personal history by omission is a really low bar for judging someone's overall alignment in my opinion, since most of the companions did it in varying degrees and most everyone is willing to forgive those in a heartbeat, even the life threatening ones.
