Incorrect article as there are studies that have witnessed individuals having mood swings.
Having taken Creatine at various stages in my life I can 100% confirm it does have an effect on my mood- around 2-3 hours after consumption. However, I would also note that having asked all of my friends who work out and have used creatine not one other person has had a similar effect.
On one occasion I bought some protein which was stacked with Creatine; after a couple of days I noticed my moods change and low and behold the magical ingredient was in there!