Yes the calculation have to take one of two (clutch1 and clutch2) values below of the RPM value. If it is possible it should take always the line/clutch on which is value >0 On the other (not engaged) clutch is then the torque under zero.
To confirm the DSG torque values across hole RPMs would be possible with VCDS logging and then to do some calculations every several hundred rpm against the dyno graph. I was able to check only the max value and that shows me around 540Nm. On dyno it was 530Nm but that was the only dyno run right after ecu flashing so the real value after adaptation can be 10Nm plus. Engine torque from ECU is showing 580-590 what is definitely too much also in peak.