"Sport" Genre Addition rejected

https://contribute.imdb.com/contribution/261008-101958-163000

I have a hard time understanding why the "Sport" genre addition was rejected. Just reading the plot summary, it should be clear that this is a documentary focussing on sport, mainly two professional extreme sport athletes. I could confirm this when I recently watched this documentary myself.

Other similar sports documentaries also have the "Sport" genre added, such as:
https://www.imdb.com/title/tt0193925/

https://www.imdb.com/title/tt0379557/ 

https://www.imdb.com/title/tt28689193/