That article is taking a lot of liberties with what the paper published (here):
Short Sprint Interval Training (sSIT) was only shown to be more effective at improving VO2max when it was compared to people that were doing "No sSIT" which included groups that either kept their "usual training" without the addition of short sprints or groups that weren't training at all.
When they compared the results to Continuous Training (CT) or High Intensity Interval Training (HIIT) it's effect was over shadowed by CT and HIIT.
Additionally, their study selection was very weak. 2 weeks or 6 sessions as their minimum is hardly enough to move the needle on VO2max and can't really be extrapolated to longer training timeframes. Really intense stuff might have just been enough to wake up peoples nervous system allowing them to run a little better or mildly improve economy over the short period. The article is trying to suggest that it's this new secret that people can do to improve VO2max.
This is all coming from someone that has written quite a bit on these boards about the benefits of speed development not dissimilar to what they're describing... but that doesn't mean it's the tool for the job here.
I don't think this study has any information that can or should be used to apply to training. That doesn't inherently make it a bad study, but at best their conclusion should be that more research is needed with longer training durations to determine if there is any efficacy to training