They seem to be offering it on the ABT site but i doubt SEAT will offer that. Dealers focus on new sales not tuning.
Either way this is another move by VAG to strengthen the CUPRA brand and thus growing SEAT even more.
SEAT is by far the most exciting VAG brand in the sub 30000£ segment. RS3 isn't selling enough maybe so VAG doesn't care about making SEATs faster now with the new CUPRA rebranding. VAG wants to sell cars.