I took the gist of the original post as saying they didn't agree with the original article and didn't think age was the defining factor of employment problems at 40. That, by developing and demonstrating relevant skills they hadn't found there to be any problems.
I took the quote as meaning that certain skills take time to master and it's impossible (which I took to be hyperbole) someone with less time would be able to master /all/ of the them; reinforcing their first point about how someone who is older should find it easier to find employment.
> I worked with someone my age who only strong skills are a large enterprise storage system. He is a dinosaur and his future is limited.