The 12:00 means gametime. Go there at 12:00 and there is leatherface. A vid of someone doing it, and i saw him ingame. Not modded. Notice when you anger him or he spots you, fog apears. It disipears when he is dead/harmed But bigfoot is a fake.
I think it's a mod as well, that chair usually is empty.
Hes not in the chair properly, hes using the /talk animation. Anyone could have made this.