If I wrote "a square is a rectangle" would you also waste time shouting that rectangles aren't squares? I didn't write that all rectangles are squares. Nor did I write that all caching is memoization.

Even your quote doesn't support your quibbling. It says that memoization is distinct from other forms of caching. Which does not mean that it is not a form of caching.

EDIT: Removed a particularly rude bit.

All dogs are mammals, but not all mammals are dogs.

If everyone starts talking about dogs every time you mention mammals, eventually you will get touchy about it.

Yeah, dogs are great. But so are cats, and llamas.