I have long said that Hydrogen as a combustible fuel is a poor choice for automotive use but a potential good choice for aeronautical use.*
Good job China for continuing to follow this path. Keep at it, and -maybe- it will work out.
*Reasons include difficulties in production, storage, transport, explosive consequences of fuckups, toxicity of spills, etc. -all of which are easier to mitigate under higher security of aeronautical use than everyday/everywhere automotive use. Current production is from fossil fuels, but production is possible using renewable electricity sources to split water. Weight is less than battery electric (which matters a lot more in a plane than a car).