I have an Industrial Technology degree, teaching experience, and time in the trades. Goat urine would be new to me, however urine stains and hardwood floors are not. Tannins especially in oak will react with the uric acid turning the wood black. Fun fact, urine is sterile and may save your life as a replacement for water when there is none. Not recommended to be repeated as the concentrations of chemicals become high. No, I've never had the need to partake and goat urine would be at the bottom of the list.
The reason for the statement that you quoted was out of respect to Steve and his experience, but your comment did make me laugh. Guess I set myself up for that one!