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So what does the date mean? Date last marketed?

Not a great thing to do IMO... by all means resurface the good stuff to the top of the blog, but why change the date? SEO? I don't think there's a good answer?

Since the date is in the URL, you broke old links, and without a redirect at that. You should look into how you "republish" because it doesn't look like you're doing it ideally.

Just some helpful advice. Without a redirect, SEO on the old post will go poof.

Are you planning on fixing the misleading date?

I understand if they need to update the date to get it to show up at the top of the blog. But, in that case they can just add a few words to the front of the article saying that they are republishing an item from September.