That's odd. When I bought my 2018 Kia Niro a few weeks ago, I asked about remote start and the salesman told me that Kia did not offer one for the Niro. He also said that there was no after-market option, either. If there really is an after-martket option, then I'm not sure if/why he'd lie about it since if Kia doesn't offer one, then they aren't in the competition! I hope he was just misinformed.
Anyway, I thought I'd share my experience. And I'd love to know if there's any option out there.
By the way, if you want to heat/defrost your car with auto start, then in my experience with previous cars, whether it's fuel or electric, you just need to set the climate the way you want it before you shut your car off.