According to the accident report, they were both pilots, there was no passenger.
The accident report also indicates that the cow was uninjured, and the plane sustained substantial damage, so really it should be “cow takes out plane”, not “plane takes out cow”.
2. Just because such an accident occurred, does not mean that the video is authentic. ("Fake but accurate"?)
The video just doesn't look right to me. I think a stationary biplane was superimposed on a background, two non-pilots got in and jiggled around (without their goggles) and somebody gave the wing spar a shove when they yelled, "NOW!"
Also: what are the chances of having a video camera on board and running when you just happen to hit a cow?