I'm pretty sure that was done on purpose. Elon is basically just a troll who shitposts on Twitter all day to rustle up jimmies of blue check marks. I remember last summer when he tweeted about taking the red pill, and news agencies lost their collective shit and wrote articles accusing him of being alt-right. Then he followed up by tweeting that pronouns are dumb, and the usual suspects nearly had a stroke. In addition he posts random dankmemes and such, so he probably has the mentality of "Fuck it, I'm rich...you can't cancel me."