No a spoof is a kind of fake the console. Your base is still the same you have but the code in RAM which defines the version of your ps3 is changed to what ever. But this don't magically installs a BD-FW to your drive which only hase the decryption keys in it.
The BD-FW is till now unhacked or better say not decrypt able. So no chance to get hands on those keys to decrypt a movie and encrypt with older keys. You will need to update so the update can install the new bd fw with the new movie keys to the drive