Those "scientists" don't say from where the hydrogen is taken, despite this is a key point. Period.
And if it's taken from air water, there should be also plenty of O2 also produced. But this is not mentioned.
So H2 must come from somewhere else. That is not mentioned as well. This is what I am questioning.
Then, you my friendly moderator, please take into consideration if it's more important the moon I am pointing at, or the finger I am using to point.