This is a seriously impressive piece. Managing 64 tracks of anything is a logistical chore, let alone decomposing the original song and balancing the remix to get that good of a sound. This guy spend something like 350 hours putting this together. When was the last time you spent 350 hours on one project?
I've done maybe 20 tracks in one piece in the most complex edit I've done yet, and honestly it's not that impressive. Which is probably why you haven't ever heard it. And I didn't log anywhere near 350 hours, maybe a tenth of that.