If someone tells you what a story is about, they are probably right.
If they tell you that that is all the story is about, they are very definitely wrong.
Any story is about a host of things. It is about the author; it is about the world the author sees and deals with and lives in; it is about the words chosen and the way those words are deployed; it is about the story itself and what happens in the story; it is about the people in the story; it is polemic; it is opinion.
An author's opinions of what a story is about are always valid and are always true: the author was there, after all, when the book was written. She came up with each word and knows why she used that word instead of another. But an author is a creature of her time, and even she cannot see everything that her book is about.
— Neil Gaiman
And it is about the reader and when he first reads the story, and where, and when he reads it the second time, and what happened to him in between, and when and where he reads it for the third time, and what else he has read in the meantime, and what else the author has written. On and on and on. And that's a lovely thing.