This is a ridiculous accusation, and yet entirely believable! I’m 100% here for it. 

His tunnel boring machine must have hit a major breakthrough, given the rate at which he is digging himself in a hole.

The point is that Elon Musk either didn’t know he was dog whistling, in which case he’s severely lacking in his understanding of media history and context for someone who wants to criticize the industry, or he did know he was dog whistling. Either way it was very bad.