Hm. Every couple of years this topic comes up like clockwork. On paper it's a wonderful idea but as you say, it's damn near impossible to get to a reasonable efficiency. I have heard that there are supplemental technologies emerging that could make hydrogen processing more efficient but realistically that is still 5-10 years away at best. Heck, likely they will still be 5-10 years away when that time comes.
That is the hold-up at this point. All the various technologies exist, but none are profitably efficiant yet.
At 6:00 of the video they touch on that and a new method that may achieve profitability.
I watched it. The problem is the fundamental limit for hydrogen compression. A lot of work has been done in all the areas surrounding it but nobody has solved the keystone.
Compressing hydrogen is very energy intensive. Until an efficient method can be massed produced its better to generate it on-site for immediate use.