I didn’t think my MY23 6.1 had this function so I tested it today. I was about to post saying it didn’t have it as I didn’t get the “D” showing on the dash…….well not for a while, but then all of a sudden whilst descending it went from “D7 to D”, so it IS there and working! Just not figured out what causes it to activate. It doesn’t always do it as I tried a few times. My “old school” way of dropping it into “N” still works better a lot of the time. The reason VW say not to do this is the safety aspect but if you’re careful/sensible it isn’t an issue and hasn’t been for me for 38 years!
The simple way you can force activation is accelerate to a speed and then abruptly lift your foot off the accelerator.
The revs will drop to around 900rpm.
(Alternatively if you are in cruise control flick the little switch on the stalk to deactivate it and you will normally go straight into 'Coasting' mode)
If you cycle through the MFD display on the dash one of displays will show 'Coasting'.
I use it all the time when I'm trying to be as economical as possible - but the averages over time don't lie.
I can get around 40mpg on some journeys but normally that is due to elevation and the opposite journey will bring the average back down to roughly around 34mpg for my van.
As others have said running the van in 'N' is likely going to cost you a lot more than saving £2 on a journey.