Amusan set a record time of 12.12 seconds, beating Kendra Harrison’s 2016 record of 12.20 by 0.8 seconds.
In the final, she took gold, although her original finish time of 12.06 was ruled out due to strong winds.
Amusan’s world record shocked the athletics world.
In November 2016, the 25-year-old tweeted: “Now unknown, but soon I will be unforgettable, I will persevere until I succeed.”
“I couldn’t believe it when I saw it on screen after the semi-finals. But it was only a matter of time,” Amusan told reporters on Sunday.
But some expressed skepticism about the race, in which many participants showed their best results.
“All the athletes looked shocked,” said the former 200m and 400m runner.
“In heat 2 we were first shown a win time of 12.53. A few seconds later it reads 12.43. Rounding down by 0.01 is fine, 0.10 is not,” he said.
Johnson received a quick and furious reaction to his comments and later returned to Twitter to clarify, pointing out that he predicted Amusan would win.
“My job as a commentator is to comment. When polling the results of 28 athletes (not 1 athlete), wondering if the timing system was faulty, I was attacked, accused of racism and of questioning the talent of an athlete that I respect and predicted. win. Not allowed. I’m moving on,” he said.
CNN has reached out to World Athletics for comment.