blind listening test evaluates a Device Under Test, not the listener
In some instances the listener is the device under test. If I claim I can tell 2 different DACs apart, I'm not testing the DACs ability but the claimants ability.
Audio nonsense
In this wonderful world of audio that we journey through folks selling stuff have sometimes been inventive in what they claim. In your trip down this road what sticks out as the most ludicrous thing you’ve seen someone try to sell?
I can point to 2 things. When I first saw a Tice clock in a store I thought it was a gag. Next- Peter Belt.