I don't mind Musk much either way and while I'm annoyed when he wants to let Trump back on Twitter after what I strongly believe was an attempt at a coup d'état, or him removing, say, the mobile charger in new Teslas I still like the products that his companies make and when he sits down and does an interview he says things that resonate with me.
So what makes someone a visionary? I mean I sit down and have a vision where Earth is a multi-planetary species, we build an outpost on the Moon within the next few years, and then Mars, and then mine asteroids. But is that all it takes? If so I think the word visionary is often either misapplied or is quite diluted. But if we take into account the need to execute on such visions, naturally, calling Musk a visionary makes more sense. Maybe we just don't have a great word (or one isn't immediately coming to mind) for someone who says "we should go to Mars, and I'm going to participate/lead in the creation of the entity that will do that".
My conclusion instead is that Elon Musk is Chaos Titan; like the netflix chaos monkey, but basically just going around causing chaos by hyping up twitter and then causing massive swings with individual tweets.