Context: two people who developed extremely destructive weapons, were horrified by their use, and had biographical films made about them.
Jiro Horikoshi was a Japanese aviation engineer who designed the dreaded Mitsubishi A6M Rei-sen ('Zero' to allied pilots). J Robert Oppenheimer was a US physicist who led the development of the nuclear bomb.
Note that The Wind Rises is only partly based on Horikoshi's life, and also borrows from Hori Tatsuo's semi-autobiographical novel The Wind has Risen (itself named after a French poem) and director Hayao Miyazaki's childhood experiences of WW2.
It is the truth. You can real literal official declassified documents from the time period saying as much. You are wrong.