In a relationship or work setting, people should be mainly judged by their actions. Hurtful things should not be ignored and people should be made responsible for their actions. I agree it's good to be aware of typical pathological personality types so people who end up in relationships with them have some framework to work with their problems and even identify a bad case and leave.
Sure, taking advantage of people is a thing that comes easily to psychopaths. But there are lots of other personality disorders and ways to act like one.
Was the CEO actually lying or just trying to squirm out of an emotionally uncomfortable position for as long as possible? The situation sucks for the OP and there are absolutely horrible employers, even psychopaths out there - but really, there's not enough data to make those claims even if you are an experienced therapist or a psychiatrist.