Found a comment from the guy who made it under an upload he made of it to reddit:
We are currently running the consequence of execution analysis on a pure-counterforce and a mixed-counterforce/countervalue attack. Actually, I believe that we'd lose 90% of the US population within a year. No power, heat, fuel. No logistics. Greatly reduced supplies of food and medicine. We're just not set up to deal with this kind of event given how our current logistics train.
:this-is-fine: