Developing is the key word in that sentence. As pitiful as Toyota's hydrogen sales numbers are, at least they have something on the market. BMW is behind even that.
If they ever manage to produce and sell them, it'll cost you a whole bunch to operate. Hydrogen for refuelling is somewhere around 13-18$/kg, which at a 6kg tank you're looking at 78-108$ to refuel. An electric car by comparison (which also costs less to buy) will set you back ~40$ for 100kWh AND you get to charge at home rather than go out of your way(if you're in California). If you're anywhere else in the world (which is an unfair comparison since you couldn't refuel you hydrogen car in the first place, but that's a different matter) that price can get down to something like 3$ in other places in the world.
They have one if you followed that link. But, to your point, no point trying to sell one without infrastructure!
A friend in San Diego had a Toyota Mirai, only available to lease, and had to therefore refuel at the station off Del Mar Highlands road. There's just no infrastructure.
I did go through, sorry if I gave the impression I didn't. I was referring more to their statement (as translated at least):
"The pilot fleet of the BMW iX5 Hydrogen is not intended for sale. Depending on market requirements and framework conditions, we intend to potentially offer our customers a production vehicle in the second half of this decade. The small series is an important step on the way to this customer offer."
