Just to note that an Apple Air Tag returns its location based on bluetooth signals to other devices and while it does give a rough GPS location, it does not use GPS signals.
Why mention it? because while GPS signals do not penetrate indoors well, anyone walking past an Apple Air Tag with the Apple App can update the location.
So glad someone else caught that. The few tracker videos I’ve seen online have all used much more sophisticated trackers. While I’m sure the story is mostly correct, the tracking part of it seems totally made up.