The author of this web page is somewhat confused concerning the court's decision.
Think about this.
You agree to make 20 payments to purchase an automobile. The dealer receives and makes full use of your 20 payments. Now the car is yours, right? Wrong! The dealer says you can not have the car because the salesman who sold it to you was not authorized to make the contract. You say that this is ridiculous, and of course you are right because you had a contract. There was an offer and an acceptance of the offer and you fulfilled your part of the contract.