in a black plague situation the following generations are almost guaranteed an economic boom of sort as there are more natural resources per capita, in a nuclear winter scenario I believe that many would die and the survivors would still find themselves with incredible scarcity.
Did you read the article? I think you are making its point, which is that it is bad but not as bad as most people think.
This is the part you should be concerned about even if a nuclear winter doesn't or can't occur. Ask yourself how many people were alive at the end of the 19th century / early 20th and then compare that to today. Remember that it wasn't for lack of trying and that this was pre-birthcontrol. Then imagine what would happen if you saddled that technology level with 2x, 3x, or 4x the number of mouths to feed.
After a nuclear war the biggest killer would likely be famine. We never think about it since we have escaped it's clutches for so long but it is one of the biggest killers in human history. A nuclear war would destroy our current global supply chain and likely much of the national supply chain as well. Billions of people around the world would starve.