Banana is mainly produced in tropical and subtropical regions.
In Guangdong, China, Guangxi has been growing food for a long time.
However, during the Qin Dynasty, it was limited by inconvenient transportation. In theory, northerners basically cannot eat it.
I haven’t watched the TV series Qin Shi Mingyue. I don’t know where the scene you took the screenshot is from. If it is the south, the south of Chu State, etc., it would be reasonable to say that there is such food. If it is the north, it can basically be said to be nonsense.