Specifically this one: “off-world vehicles not made on this earth.”
That feels like a crafted, or intentionally obtuse statement. Now there is something to be said for the clinical and dry phrasing of scientists or the military. But this doesn't read to me as "extraterrestrial" and certainly not aliens.
Combined with the assertion this week that Russia was testing a space-based weapon[1], this reads as "A foreign adversary has built a vehicle in space. And we might have captured one."
[1]: https://www.wired.com/story/russia-space-weapon-twitter-hack...