You'll be fine. Going from your previous posts you're doing well with VCDS.
Open 37-Navigation, then Adaptation, read channel 01, write down the current value just in case you may need it, then enter a new value (this will be you wheel circumference in mm), click Test then Save.
The guy in the video can access that info only because the control module lets him. He was working on a newer car platform and it is dependent what is written in the firmware, so it's not a feature missing from your VCDS. The software / firmware in the D3 is generations old now.
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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