I don't recall whether he did or not. Will have to go back and check.
All I can say is that I am no stranger to danger when it comes to musical volume levels and would have to say that the 846s sound the same at high levels, just louder. no lose of defintion, no distortion, no clipping....nothing.
What I can also say is that I have deliberately pushed the bass on the SE846s - heavy, deep bass, boosted and EQ'd at near full volume - conditions that would cave so many other IEMs in, and the 846s handle it fine.
A slip of the finger when using EQu led to a slightly scary moment, haha. I think I spiked the lower mids badly. A bit of crackling was the end result before quickly resetting the curve.