The article establishes pretty clearly Dittman is not imaginary, and he is not Elon.

I’ve been skeptical, but I thought it was possible. The evidence seemed weak, though - I’m a relative nobody, and when I had a tiny bit of e-fame there were a few people out there relentlessly cheerleading/shilling me and aggressively agreeing with everything I said. So the fact Dittman did this with Elon was hardly conclusive. I thought they did sound alike, but that’s not conclusive.

A few people did claim they heard Dittman in spaces while Elon was on live television, but of course since I could not verify that for myself I considered it possible that they were just Elon boosters making that up to defend him. But it looks like they were right. Musk and Dittman are definitely different people.