BMW went to "lifetime" fill on auto transmissions fluid back in the 2000s. Justification was better built transmissions and higher tech synthetic fluid allowed for no changes. After a number of year's BMW eventually defined that "lifetime" equaled 125K miles.
My guess is similar is in place here. My BMW mechanic advised back then, (for BMWs) that if you don't change at 60K then don't risk it and drive it until it breaks. He saw many tranny failures occur right after high mileage transmission fluid changes.
Again; that was BMW and not Kia, but similar may apply here. My take is change fluid at about 60 (if conditions apply) or drive it until you define its "lifetime." I'd also worry about finding qualified technicians as this seems like something few if any will have much experience with, so pick wisely if you decide to "break the seal".