There are some other cool things there, like work on developing a simple dust removal system for solar panels (would be really useful on Mars) and a...
If I’m understanding the abstract, this drive requires very dense mass, so perhaps possible in theory but not with foreseeable technology and perhaps...
Of course, I don’t claim expertise here, I just remember reading an article where a doctor made a distinction between gross compromise of large parts...
I believe it is primarily due to a large number of older people in those crowded settings which have a less effective immune response even if healthy...