Not that this is an amazing article, but the question is, how is this different than Loon and more likely to succeed? Loon LLC CEO Alastair Westgarth said the company could not find a way "to get the costs low enough to build a long-term, sustainable business"
This was the company that not only deployed high altitude stratosphere balloons, but managed to map high altitude wind currents at the point where they could navigate balloons without propulsion systems and used LTE to successfully cover various parts of the Earth.
My guess would be a Japanese government subsidy.