I have not invested in this hobby nor received medical advice related to it. I've also not read any papers related to it, but I trust the people exercising this sport to proceed with necessary caution. It's rather big deal nowadays with lot of commercial toys available, so I asseume there's material to read how to do it relatively safely.

I've done other extreme sports for large part of my life, and can tell you that people in these sports (especially professionals like in the OP) are very aware of the risks associated.
You don't need to tell me I'm risking breaking my neck when flipping, I know it already, you don't need to tell me about how my hobby or profession may be dangerous, I'm well aware.