This is a research paper, so it’s gonna be at least a couple of years until ot could be seen in products. However the battery uses hydrogen, it’s effectively an alternative to fuel cells, so the use case would be in vehicles rather than yout phone. That being said, hydrogen fuel infrastructure is almost non-existent right now.
I think the point is trying to get it out there, so people can share it once the original source is taken down. Doing it anonymously just prevents you from being sued.