Sadly, this "Patreon Exclusive Code" is for $9 subscribers to my Patreon.
(I didn't make the passcode purchasable here because I personally find the value too high for a simple hair-change. $9 on my Patreon has a lot of perks to offer, but to make it a single purchase here for a simple extra feature doesn't sound like a good idea. It's only meant for fans.)
I will try to remove this option (if you don't have the passcode) in a future update to avoid confusion.