Paasat B8 2.0 TDI 150hp 40k miles

vw maindealer may forget carry out DSG oil work.
As the youtube video shows, the DSG oil filter locate under the battery tray. In order to access that place, the technician must take down the intake pipe, battery and battery tray. Is that right?

The evidence, I marked on the screws , when I get back car, all of screws are exactlly at the same position and angle. I highly doubt the vw technician did not carry out DSG oil work, although the paperwork shows the DSG oil work is done. How can I do now? Thank you.