For some reason, I missed this thread until today. I am very familiar with that BRS video. It is a Skytrek, as megan pointed out and not a Bristell. The pilot is a well-known and highly-experienced Kiwi instructor, who flies many types on wheels or floats, with wings or rotors. I know him well - he did the BFR that qualified me for a Kiwi PPL and he also gave me my first helicopter lesson.
He was employed as the factory test-pilot and was doing a routine flight test. The YouTube video only shows the later stages of the spin. I discussed it with him and he told me that he had tried the standard spin-recovery techniques prior to the start of the video clip, where he can be seen trying other potential methods of recovery.
I find it ironic that the only injury he suffered was a bang on the head from the canopy while exiting!