It's not, FF2 and VSH are 2 different things. VSH only has 5 boss (iirc) : Saxton Hale, Horseless Headless Horsemann, Christian Brutal Sniper, Vagineer, and Easter Bunny. https://wiki.teamfortress.com/wiki/Horseless_Headless_Horsemann
I believe it was just a test server that Yuki put up. Don't quote me on that