Hi Doug,
The author is Michael Barnard. He is also the author of some AWE articles (Airborne Wind Energy: It's All Platypuses Instead Of Cheetahs - CleanTechnica) discussed on Barnard’s predictions - Analysis / Industry and Market Analysis - AWESystems Forum.
And as you know, Mike Barnard does not favor hydrogen:
Concerning EVTOL (since this topic is dedicated to it), see also other sources, for exemple on EVTOL drones to carry people - Lounge - AWESystems Forum.