How can you argue that it doesn't?
I think the whole beauty of literature is in trying to determine the inspiration behind a work's conception, that fleeting spark of creativity which compelled the writer to construct a story, or a sentence in such a way as to best express a specific sentiment.
I think Hemingway's six word short story is amazing, what it implies and the thoughts that it provokes. Don't you see how it's conciseness contributes to its affect? What's so good about it is that he doesn't explicitly reveal the details of the story, but instead allows us to question our own interpretations, and explore the possibilities for ourselves.
Why are the shoes never worn?
Why are they being sold, If the baby has died, then why are they not kept for sentimental reasons?
Why is the advert so short? Is it painful for the person to provide a more detailed account?
Who wrote the advert? A mother?
What compelled the person to write the advert and sell the shoes, surely they will not make much money from them... Is it even worth advertising?
Or the whole thing could just be a story about a shoe salesman, and ultimately a big mind **** that sends us down a road of unnecessary interpretation
I quite like it.
/Englishy rant