I have no idea what they actually measured, seems like camera
and speaker position changes with each cut, but hard to tell since the overall effort is so poorly controlled. I am pretty sure the camera is the mic, I actually listened to this excruciatingly poor test.
I love these random posts of YouTube reviews, with lots of things changing, no scientific methodology, designed to create a difference rather than test for difference. Followed by the uncritical question "Can you hear the difference?" My question to the OP
@Tangband , why would you expect these cuts to sound the same when the measurement and the test subject are moving even with the same amp???