He bought the car in 2015 so he’s lucky to get 8 years. Especially since Hyundai only provided a 5-year warranty. That seems pretty crazy to spend US$100k on a vehicle with a new technology.
When the Prius first came out they offered an 8 year warranty (or maybe 12) on the hybrid system. And that’s more familiar to mechanics than this fuel cell tech.
Tl:dr; don’t do stuff like this unless you’re ready to lose all your money. The owner got 8 years of utility out of the vehicle.