Something bad? Well, the code certainly is not malicious by any means so there is nothing truly bad at play. By guessing URLs, one can also crawl back through time and look at archived San Francisco store pages so the redirect does have an upside. It does however seem like a rather complex and contrived way to display a changing page. And it also makes it more difficult for those relying on screen readers and mobile browsers to access the page.
Now, I am sure there is a reason I am not thinking of. But what could it be?