If this is authentic, Neff-U did as good of a job as he probably could have. I still think the song is painfully average, but I love the small embellishments. It goes to show that Neff-U is one of the best producers to ever work on an unreleased MJ project—he just understood how to do it right in ways other producers didn’t.
That said, I still don’t believe that this is real. It sounds like a VERY high-quality seminar recording with overdubs. I can think of a single MJ rough mix that sounds this bad. The estate has released some bad quality mixes in their day, but if this is truly all they had to work with for this song, I’m not at all surprised that it hasn’t come out yet.