What part of that confuses you? Hydrogen is better for cars VS batteries in every meaningful way in 2024. Long range, quick fill ups, zero harmful emissions, don't need to live in SFH or rely on landlord/HOA to grant you the privilege of charging your car.
Hydrogen cell cars are electric cars that don't rely on severely underdeveloped technology of batteries we have today.
Hydrogen can be generated any time. Like when nuclear or solar or wind energy is otherwise going to waste. We don't have and likely won't have batteries that could replace it for decades.
Modern batteries are absolute shit and definitely not good enough. I think a good indication that batteries are anywhere near useful will be when you can fly on battery power across the Atlantic.