These things have been around for a while. I was always told when looking to buy a car, to check the transmission mileage matches the odometer reading in VCDS, which is what Andrew At Volkswizard recommends also.
It’s worth noting the transmission mileage is recorded in km, and in the UK we use miles on the odometer, so you’ll need to convert the transmission reading to miles. Hopefully it should match your odometer!
I’m sure the mileage blocking inventors will soon try to invent things that block the mileage to all parts of the car. It’s a game of cat and mouse, and as all instrument clusters are digital these days rather than physical rotating numbers, it’s a case of clever software and IT hacking that can deceive unsuspecting buyers.