ffmpeg – Can anyone open this corrupt (?) M4A file (and convert it to an MP3 or something that I can use)?

I was just looking through an old harddisk, and I found some (apparently) M4A files that I’d love to listen to (it’s recordings of me and a friend playing guitar). But neither VLC nor any other app that I tried seems to be able to open it.

josh.ch/files/road-trippin.m4a

I even tried FFMPEG and FFPROBE, and both resulted in this:

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x12be06fb0] Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible!
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x12be06fb0] moov atom not found
rhcp - road trippin-1.m4a: Invalid data found when processing input

The files are contained in a WhatsApp backup that I created a few years ago with some macOS software (I don’t remember the name anymore).

Any help is appreciated!