Wasn't there a recent study that suggested that mindfulness meditation is correlated with an increase in narcissism, not a reduction?
Can't say if he's on the psychopathy spectrum or not, but he has admitted to be on the autistic spectrum, and I think that alone must be enough of a hinderance to running a social medial company.
However being autistic is not an excuse for this kind of behavior. Many autistic people have sensory issues and will appear rude when they suddenly withdraw from a conversation, or have an unexplainable tantrum. However neither of these is what we are witnessing in Elon’s behavior. His is simply rude and disregarding of other people. That can be an indication of psychopathy (but doesn’t have to be). If this was a tantrum we wouldn’t be able to understand him this easily, and this is engagement—which is the opposite of withdrawal—so we can rule out over stimulation.
I think the most likely explanation here he is simply a bad person regardless of autism or other neuro-divergency.