It might have to do with the title. "I got a Computer Science degree in 3 months" makes it sound like it isn't serious. As you note, reading the article shows that the author worked hard, learned the material, already had an associates degree in the field, already did a semester in CS at a major university, and took 4 study.com CS/IT courses and 3 Sophia Learning CS/IT.

So the headline makes it sound like "look, here's an easy way to get a piece of paper that says you have a CS degree" when the reality is that they'd already done a lot of the work before enrolling and as AviationAtom notes, WGU works off demonstrating that you have the knowledge.

This isn't "go from zero to CS degree in 3 months". This is "if you already know a lot of your CS stuff, you can work really hard filling in the remaining gaps and showing that you know what you're doing and get a degree in 3 months." Between the associate's degree, a semester at Concordia, and the pre-WGU online courses, they'd probably spent 2-3 years learning.

I think the issue is that the title makes it seem like it's easy. It probably isn't the hardest program, but a decent amount of the author's ease comes from the fact that they had already filled most of the requirements - and just needed to demonstrate their competency. Which seems like it's part of the point according to AviationAtom.