What you really need, unless you take the wheels off and check all four wheels is, request a copy of "CAR DATA" from your local SEAT dealership parts department, it might be free or they might charge you for searching for that info and printing it out - that printout should confirm if "brake wear warning" has been included into the initial build of that car, and much more.
My wife has an August 2015 VW Polo 1.2TSI 110PS SEL - and it has zip all in terms of brake pad wearing warning, strangely ECP do not sell any pad kits that do not have that built into them, so if I buy from ECP, I'll be cutting off the cable from a front pad.
Edit:- by the way, according to the CAR DATA printout for my daughter's May 2019 Leon Cupra, her car does have brake wear warning fitted to it.