From the video there is a clear and distinct thunking noise. There also appears to be a loud clock spring noise in the steering wheel unless that is your hands squeaking the leather steering wheel but it sounds like a clinking clock spring noise too like twisting of wires in a harness.
Why in the world would you sign papers for a noise you heard on a test drive of a brand new vehicle and believe what any dealer has to tell you or promises you? I would not have accepted that vehicle and either looked for another one or ask them for another one before signing any papers. You can check in your state if there is a cooling off period Or 3-day grace period where you can change your mind and unwind something like this. Look at your lease contract and read it carefully.
Why in the world would you sign papers for a noise you heard on a test drive of a brand new vehicle and believe what any dealer has to tell you or promises you? I would not have accepted that vehicle and either looked for another one or ask them for another one before signing any papers. You can check in your state if there is a cooling off period Or 3-day grace period where you can change your mind and unwind something like this. Look at your lease contract and read it carefully.