Thinking about how neither H nor M show interest in learning about things...
One marker of Narcissistic Personality Disorder is the topics of conversation that people feel comfortable with. Obviously people with NPD seem happy when the conversation is about themselves. The other type of conversation they feel comfortable with is the one where they're the "expert," i.e. they feel they know more about it than anyone else there. Could be literally anything - an abstract topic, or what time their neighbour put their bins out yesterday - but they HAVE to be the one imparting knowledge.
Any other type of subject? They will try to steer the conversation back as fast as possible to themselves, or to something they feel they are the "expert" on.
Learning can be very hard for these people. It's not going to happen organically, from listening to other people who know more than them, and asking questions. Because they hate that kind of interaction and will steer away from it. Of course, there are books, etc, but more or less any kind of learning involves acknowledging that there are people (usually quite a lot of people) who know more than you do about a given topic. And that you are unlikely to become the pre-eminent world expert on most things.
The people I've known who (I strongly believe) have NPD have been surprisingly ignorant. They might read an article, or even a book, about something, and then trot out a superficial fact or theory, but only if they believe they're the only person in their circle with even that level of knowledge about it. Otherwise they adopt the "proud to be ignorant" pose which shows disdain for some types of knowledge/learning as a waste of time - they are just superior to that type of thing; their natural perspicacity is a better guide. And (in my experience) they LOVE talking about their own childhood and history, and about their families, particularly the dead ones and the very young ones who can't contradict them. Because these are subjects which they can plausibly be the expert on.