Correct, That is the headline, which is true, and not as clickbaity

The faux headline of "We'Ve NeVeR LeFt tHe AtmOsPheRe" (same as the one that OP wrote) is more misleading, and I'll explain why.

A headline saying "we've never left earth's atmosphere" is terrible clickbait, because for most people's understanding, the atmosphere does not go past the moon, so now a moron or a child walks away from the title of an article thinking that we've never gone to space or landed on the moon.

However, the headline "earth's atmosphere goes past the moon" is still true, but the atmosphere that reaches further is so thin it's barely even perceived. Technically, the moon and surrounding space are still in the earth's atmosphere, so from this fact, we can technically say that we've never left earth's atmosphere, but the required explanation of why that sentence is true needs to come first. The clickbaity "We've never left earth's atmosphere" line is literally the last line of the article, after all of the explanation about what the scientists have found.