I’ve looked and can’t find anything that supports that, or that supports Japan by itself being close to creating a nuclear bomb during WW2. There is historical evidence that Germany was close, however.
After WWII the top German physicists were imprisoned in a house in England that was bugged. No evidence was found that they were close to a bomb. Certainly Germany did not have anything like the Manhattan Project, a vast industrial and scientific enterprise with unlimited resources that was required to build our atomic bomb.