I agree with the comments above. On our previous 68 plate A3 S-Line, the bolster/seat base side closest to the door was leather, but inner side was faux. It looked worse than one or the other, as the leather would crease and the faux side looked brand new.
The Cupra seats show no signs of wear/creasing which would concur with
@Damo H above.
Also our 5 year old FR with 100+k miles interior looked brand new when we sold it, so seems to hold up well - far better than the equivalent age/mileage Octavia VRS that we had at the time.