Seems to me that all the article is saying is that you can build some muscle by lifting light weight to muscular failure/fatigue. I would much rather lift the heavier weight and get it done quicker than lifting light weight for 24 reps.
"The findings would have implications for people with weaker muscles including the elderly, patients with cancer, or those who are recovering from trauma"
Also as stated by the guy on the bottom 'While there’s certainly evidence that it’s possible to build some muscle with lighter weights and longer duration, there’s an overwhelming body of evidence that says we need the opposite for the best results.
'If we were talking about other health and fitness benefits there’s a whole load of good reasons for not going so heavy, but not when it comes to bodybuilding.'
All this article show is that you can build a bit of muscle by lifting for 24 reps.