I had a boss who liked to announce various new software features in email updates to clients, but frequently didn't bother to tell the engineering team to implement those features. I got tickets where a customer asked, "how do I make feature X work?" for a feature that didn't actually exist, so the task for the ticket was to create it.

At least Musk is just exaggerating the capability of an actually existing feature. On the other hand none of our missing features misled anyone to think that a dangerous device is safer than it is.