From what I've read Lufthansa never banned AirTags, regardless of what a misinformed customer service person on Twitter may have thought. They clarified their guidelines to say that active transmitters were not allowed in the hold because they couldn't be put on to flight mode (pretty much correct according to ICAO guidelines), and then after all this blew up later clarified their position by confirming that AirTags…
But why do AirTags not count?
It's also been fairly well understood for a while now that Bluetooth is not a concern on flights, and it uses an ISM radio frequency which is specifically set aside so as to not interfere with things like planes and other critical communications infrastructure.