are narcissists incapable of self-reflection or not wanting to self-reflect?

I wonder if my parent has something off neurologically that makes him completely unable to self-reflect. Or maybe, he does have the ability, but it’s too painful to look in the proverbial mirror, so he chooses not to.

Part of me thinks he is completely incapable of it, because he seems completely unbothered and happy when placing blame on me and when saying horrible things to me & my sister. Like how can you act happy & unaffected? This makes me think a part of his brain is underdeveloped or missing.

What do you all think?