When in doubt as to whether an article is original research, try looking for some of these standard components:
In this abstract, the researchers describe their experiment. They aren't reviewing or commenting on another researcher's work, they are describing their own original research experiment.
This section is where the researchers tell their readers how they did their experiment. Knowing how an experiment was conducted allows other researchers to replicate the experiment.
Results and Discussion
In the results section of an original research article, the authors talk about what they found through conducting the experiment.