The bold decision to Black Widow his way into the MCU was a funny one, but it’s also pretty coincidental. Simu Liu surely auditioned for Shang-Chi and the Legend of the Ten Rings well before he knew that pose joke was in Black Widow. Even though Black Widow‘s release had been halted due to the pandemic, there is pretty much no way Liu knew it was going to be a running joke in Scarlett Johansson’s film before he even got the part and became a member of the MCU.
Source: Cinema Blend