You're missing the point. If an Android user is travelling with an AirTag other people (e.g. a colleague) with iPhones will "send the signal to the motherships

You're missing the point. If an Android user is travelling with an AirTag other people (e.g. a colleague) with iPhones will "send the signal to the motherships" but they won't get the alert as they most likely won't be in proximity of the AirTag long enough to trigger it.