I'm not sure that course completion percentage is necessarily the best metric to be drawing conclusions from. I will often sign up for MOOCs and courses for a single talk, chapter, or topic that I'm interested in with no intention of actually completing the course. I wonder I'm an outlier in this regard or if this approach is much more common than the author of this article realizes.
I’m taking two courses on Coursera right now but only paid for a certificate in one. I plan to view all content from the other course, however Coursera will not grade the end-of-section quiz for non-paying students. It seems the only way to “complete” a Coursera course is to pay $50 so the assignments will be graded. At least this is the case for: https://www.coursera.org/learn/battery-management-systems
But then again, except for entry level positions, few hiring managers care about any formal education for IT positions.
From what I can gather, the few certificates that companies care about are RedHat, Cisco, and AWS certs. I’m sure there are a few more that are outside of my area of expertise.
I went through the Microsoft Architect Certification track as a commitment device to force me to study, but I didn’t put it on my resume and never told my employer. But I was trying to transition from a C/C++ bit twiddler to an “Enterprise Developer”.