I think this paper is bunk. The case fatality numbers are way too high, IMO - 2%, 2.5%, and 3%. I don't think this will be true for economically productive aged people. And its dated "February" with no precise day.
See pg 11 Table 2; I can't paste tabular data:
https://anu.prezly.com/coronavirus-i...achment-171409
The Global Macroeconomic Impacts of COVID-19 Seven Scenarios.pdf
2 MB pdf