Shawn Lee probably sampled from that song, since he usually does that when it comes to songs that don't really fit his "musical style".
Either that, or he asked/paid the original author for permission, then forwarded the license over to R* for them to use it in the game.
I think the fair use should still be applied even in your case, regardless of what Youtube's auto detection says.
If the preppies fight theme is covered in fair use, then so should this track.
