Its usually better to downsize your rims/tires for your winter setup as they perform better in the snow. A smaller and narrower tire has better grip and performance in snow or ice. This is both because the smaller tire cuts through snow more effectively and because the weight of the car is focused on a smaller contact area.
I agree with this, but still I wonder what kind of tire they used on the 22 inch rims. Which 20 inch rims and offset will fit on the I-Pace? Same as will fit on F-Pace and XF? I guess you don't have to buy original rims? My dealer said nothing about this.