What they aren't telling you. The real reason Simone Biles quit.
Biles already knew she that she was unable to pull this routine off. And if she didn't pull it off. Bye, bye medals, fame, glory, etc...
From an interview: At the Tokyo Olympics, Biles could have a fifth skill named after her in the Code of Points—a dangerous Yurchenko double pike vault that besides Biles, only male gymnasts have performed in competition.
At podium training in Tokyo on July 22, Biles trained the vault, although it’s not clear when, or if, she will actually try the vault during the three remaining opportunities she will have during competition—the team event, the all-around event, and the vault final.
If she does decide to do the vault during one of those events, it will be “because I can,” as she said. In her mind, it was easier to quit and have people say she would have won it. Than to compete, lose, and remove all doubt!