Yes VCDS should reveal all, if it shows values for soot, oil ash etc then it thinks the car has one which indeed it does visually, you could try a forced regen but when I did that it refused saying a parameter was not met without saying what said parameter was, par for the course with the chocolate teapot.
Keep an eye on the readings and also the DPF differential pressure, the values for soot and ash are calculated and not real, the diff pressure is real, if you see the soot and ash reading lower than they were (regen triggered at around 22g of soot I think) and also a lower diff pressure then its reasonable to deduce that DPF regens are being commanded and doing what they should.
You could also look at the commanded and measured values of the EGR valve position, if it says N/A then its been coded out in as much as the ECU doesnt think it exists any more, maybe the coding is a software patch that pretends it is still there, in which case you can manually command it using Output Tests and feel it to see if the motor turns, in my case with the emulator simulator the EGR wont budge but the output from the position sensor (false output from simulator) will tell the ECU that it has moved by the correct amount.
I hope the above makes some sense, I know what my black box (emulator) does but I dont know what the tuners do when they claim to "map out" something, I am speculating with an educated guess.