The second goat was not sent into the wilderness as a sacrifice to a foreign god or demon. The act of sending the live goat out into the wilderness, which was unholy ground, was to send the sins of the people where they belonged—to the demonic domain. With one goat sacrificed to bring purification and access to God and one goat sent to carry the people’s sins to the demonic domain, this annual ritual reinforced the identity of the true God and His mercy and holiness.
I am not sure if I agree with the specific claim of the author about the Hebrew word involved, but the concept is certainly thought provoking.
I also just wrote about the subject of demons recently.