In this situation, do you have the right to drive behind the signalling device?

Why?

At the end of the video, the traffic light on the right is green, allowing you to pass the signal. You may move off behind the scooter while keeping a safe distance. Before entering, make sure you can clear the junction and will not prevent pedestrians or cyclists from leaving the carriageway.

§ 95 ust. 1 pkt 1 i ust. 2 rozporządzenia w sprawie znaków i sygnałów drogowych