IMHO, yeah, Tesla slightly stepped over the line w/their phrasing.
But, the bigger issue is WHY ARE ALL 5 STARS NOT THE SAME?!
I actually learned this when the Model 3 got their 5 stars, IIRC, Musk on his twitter feed or something mentioned that the X is actually safer because it's heavier and it's 5 stars is better than the Model 3's 5 stars.
Well, who knew that before?! For a long time I assumed 5 stars in a sub compact was approximately the same as 5 stars in a pickup truck. It didn't really make sense that they'd be exactly the same safety, but I kind of figured the minimum score for 5 stars was relatively low, or scores in different areas offset themselves enough to make the math work out.
Fix the bigger system, not just Tesla's claims.