One shot is confusing precisely because it means different things in different contexts.
It can either mean: 1 prompt, or it can mean a prompt with 1 example (in which case zero-shot means 1 prompt with 0 examples).
It also has different meanings in other contexts.
The article includes the entire prompt OP used in the first section. I think it is pretty clear.
That seems less like an issue of the term having multiple meanings and more an issue of people misusing the term frequently.
People misuse the term "literally" frequently, for example, but that doesn't change the meaning of the word.