its equally silly as the other methods. even worse as should have been obvious by the fact they quote a video.

imho poison is the ONLY method slightly acceptable.

with fifo it's all too easy to mislead the system with a honest transaction and now the vendor has the stolen btc, even though they delivered something in exchange for it and behaved honestly all the way.

edit: they measure total coins marked as stolen from begining to end of each tracking process, not correctness. as all the exchanged want is to have less poisoned coins to work with.