That is making assumptions. How do you know that separate device isn’t telling the AirTag its location and the AirTag then encrypts that location with an encryption key and sends it via the separate device to Apple’s servers? So, sure the AirTag only knows it’s location when it within Bluetooth range of an Apple device. But that should be the case a lot of time we would hope.The point is, an AirTag has no way of knowing where it is. A separate device can tell you where it is, but the AirTag doesn’t know.