In this situation, should you signal your intention to change lanes with the right turn signal?

The D-14 'end of lane' sign and the guiding arrow on the roadway (P-9b) visible in the final part of the recording inform that the left lane you are driving in is ending. This forces a lane change to the right. According to Art. 22 para. 5 of the Road Traffic Act, the driver is obliged to signal the intention to change lanes clearly and in advance, in this case by using the right turn signal.