That mp3 is ~6 minutes of silence, then ~4 seconds of speech at the end.
All of the ~4 seconds of speech sounds fine to me …
If you can hear crunchy distortion on the above WAV-file,
then it’s on your side: only on playback on your system.
There are tiny clicks, which are normal,
but can be removed with a DeClicker plugin if you need a polished result …
