There is no substance to this blog post. It is just someone claiming certain industries still use mainframes...ok. Not sure why people are upvoting it.
Over time I've developed a speed-reading technique where I skim quickly past the common introductory/padding words of no substance. I just found myself at the end of the article feeling like the whole thing was just an introduction with no substance or conclusion. Then I came here and saw your comment, so I know I'm not alone.
I badly wish for every article to have a tl;dr version at the very top.