Yes, I agree. Hydrogen can be used in combustion engines, but practically it is not, Its much less efficient. I disagree that burning hydrogen is 'suitable' for powering large vehicles because of its lack of energy content per mass. Any research are hydrogen powered aircraft are using it to generate electricity, not to burn it directly. The bigger problem there is storing enough hydrogen under pressure to make a practical difference.

Even if I'm wrong, and burning hydrogen becomes more practical in applications rather than in fuel cells, the fact still remains that you have to somehow put energy into the system first to get your hydrogen. Its still energy 'storage' rather than creation.