Earlier quoted context omitted.
would be interesting to know the relative trajectory – would help determine if it was a known satellite reentry or on a typical orbit of debris (lots of periodic comets have well known debris trails, they form most of the "meteor showers" that happen yearly.)
Maybe it's something from the recent Rocket Lab launch?
I'm guessing only the final stage would still be airborne/in space once it orbited around to populated areas. And the second/final stage should be deliberately de-orbited for exactly this reason, right?