There's a possibility, the version he heard was an earlier version of the song which Michael recorded, before it was possibly reworked into the version we've heard that michael might've not recorded?
There's another possibility this is not the version Brad plays, as Brad might possibly have a multitrack mixdown of the song, I have an audio somewhere you can hear a multitrack count-in noise on Man In Black which can suggest, that was with the lead vocals muted, and in this case, it'd make sense why this song specifically is among the ones that get copyright takedown notices on youtube.
This is all speculation, as there's no definite answer, nor much proof to back up any of this.