New test feedback: done Seat Leon 3 / Golf 7 MQB mileage correction with Xhorse VVDI2 VAG 5.2.1 success.
Open VVDI2 software
Select Seat->Key Learn->Immobilizer of instrument platform MQB-> instrument with NEC+24C64 MQB key
Click read data, auto detect vehicle type etc
Click on Read KM
Current mileage: 500KM
check odometer on instrument, it is the same
Enter the mileage you desired:118090KM
Click on Write KM
Accept VVDI2 warning messages
The dashboard indicators go off during the procedure, it is normal.
VVDI2 Seat Leon 3 MQB odometer correction is done.