They should focus on straight forward hydrogen combustion engines. If Ev's survive then they should survive on their own tech battery advancements. Don't mix the two together. That's just silly
Why would they? A combustion engine drive-train has an efficiency that's significantly lower than that of a fuel-cell EV drive-train. Combusting hydrogen in an ICE as opposed to oxidizing it in a fuelcell is just a waste of energy.