It’s awesome that they are doing this, but doesn’t that incentivize people to use trackers that are not to that specification?
AirTags always need an iDevice to be close by to update their location.
Nit: they’re very very detectable, just not using your off the shelf phone.
If it’s hidden in a metal frame then it’s not going to get a good GNSS fix. And if you’re doing a deep sleep you’re powering down your GNSS module so not getting a proper warm fix.