Apologies for being critical, but this reads like the author had a conclusion they wanted to reach and worked backward to some flashy graphs to make it work (the right side of the "lies, damn lies, and statistics" spectrum). There is no discussion of confounders, no control groups or paired studies, and there are million things correlated with the last 50 of societal development years besides the topics mentioned her…
What you're missing is that they've already published the papers and books with all of the citations, these are accessible articles for the masses reviewing their conclusions.