It’s explained that the audio should sound sped up but why is? How would we slow it down? How would a user understand this?
the reason is written right there in the challenge
The audio clip may sound fast and be difficult to understand, but that is a normal speed for screen reader users.
It is not a regular user who is using this, but a screen reader user who cannot use their sight to read. The setup of the screen reader is specific to the user. (they can slow it down or speed it up)
Ah I see, so the screen reader does all the work