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That's an unconvincing argument because the presence of ultrasonic sounds can affect human perception. It is just not perceptible via the exact same mechanism that ordinary sound is.

The argument you should be going with is that the speakers and headphones that people will be playing the music on doesn't do ultrasonic sound.

This is a good point. Also, I don't see the economic incentives for this to be snakeoil.

"ultrasonic sounds can affect human perception. It is just not perceptible via the exact same mechanism..."

talk about unconvincing

If the average human can’t hear these sounds, that’ll just make the audiophiles think they have above average hearing.

I think I misunderstood your first message. Yes, you are right.

For simple listening there is no benefit. As you pointed out it ca be beneficial if the audio is processed (for instance, slowed down).