I can’t quite reconcile this article with what I’ve seen before like this below…the methodology in the OP seems pretty questionable, so I trust this other article more.
https://www.aei.org/carpe-diem/fortune-500-firms-1955-v-2016...
https://www.aei.org/carpe-diem/fortune-500-firms-1955-v-2016...
I think it’s not an unreasonable argument that the process of market disruption (over the past century at least) isn’t being driven by “the endless pursuit of profits that can only come from serving customers with low prices, high quality products and services, and great customer service” (LOL) but by some insane demographic changes occurring in the background of equally insane technological progress.
It actually seems quite delusional that, knowing about Moore’s Law/baby boomers/more than 5 tv channels, this person decided that customer service would be more important in deciding how the economy moves. Bonkers levels of autofellation, I say.
I don't know whether that's true or not, but it's notable that your article counts companies as "leaving" the list if they merge with someone else.
My Approach to suspect articles is to look for data that would either confirm or deny the claim in the article. Google article results are usually garbage so I look at image results to find actual data tables or charts. In this case, I found the link you posted by searching "Fortune 500 company turnover by year" and looking for line charts with a reasonable time frame.