>If it's not patched yet: I heard you can just power cycle a tag on a timer to evade detection

I'm not sure how apple could ever patch it. If you were willing to add a power-cycling microcontroller to your airtag, it wouldn't be that much effort to also add a bank of airtags to cycle through, which would make the apparatus totally indistinguishable from a group of airtags coming in and out of range constantly.