I really hope that something like this might help save some lives in the COVID hotspots from lack of oxygen. The boast about this being the only article using

I really hope that something like this might help save some lives in the COVID hotspots from lack of oxygen. The boast about this being the only article using AC is bugging me a bit though, because the AC is being fed through a bridge rectifier first. The other thing that’s bugging me is all the mentions of efficiency but no measurements of their set up. Why bother bringing up efficiency if you don’t care about it?