We don't need to know this. We can clearly see ample altitude at the time he abandoned the plane. Although there are reasons to jump at great altitude (severe fire, etc.) none of those reasons are apparent here.
When a competent driver loses engine power while driving they do not immediately stop their vehicle in the middle of the road. They will use the available momentum (pulling to the shoulder or whatever) for the benefit of their own safety and the safety of others, and ground vehicles are deliberately designed to achieve this. The analogy for (conventional, fixed wing) aircraft is altitude; this pilot wasted available altitude for no discernable reason despite the fact that he had a perfectly functional glider.
No competent pilot would do that. So the best case here is an incompetent pilot that shouldn't hold a license. All other possibilities are some form of attention seeking fraud and also reckless endangerment.