It doesn't seem fake, it just seems like it's not actually a figure. Swap Force had a ton of weird random palette swaps and I heard SOMEWHERE(maybe a GDC?) that Wind-Up was used for testing a lot - this was probably made just to diferentiate him from the release version.
--- SO I'LL GIVE YOU WHAT YOU WANT
(What I need is never what I want)
Edited 1 time - Last edited at 16:17:54 17/03/2019 by Bifrost
He's not in the code for the other games is he? Would they really remove the code for a released figure from later games, even if he was just a limited employee release?