This is not a new phenomenon. I had this happen to a title years ago.
The advantage for the reseller is that the book has its own product page, which makes it more visible. But it also confuses customers who see that copy first.
In my case, the reseller called the book a mass-market paperback. (The only paperback edition that ever existed was from Createspace, now KDP.) According to the page, it was published in 1705 (when there were no mass-market paperbacks--or even paperbacks).
The first time I complained, the fake page was immediately removed. The second time I complained, I couldn't get the KDP person (or bot, or whatever) to understand what I was saying. I eventually gave up.
I just checked, however, and the mass-market paperback edition no longer has its own page, though it is listed as a tab on the main page. That's not as a big a deal. Nor is the price as outrageous, though oddly, it's higher for a used copy than the new paperback price would be. It's hard to visualize anyone going for a pricier option.
It may be that Amazon is wising up a little. But it wouldn't be that hard to create an automatic routine that rejected impossible publishing dates. It also wouldn't be hard to prohibit someone from selling a used copy for more than the new copy is worth, except for out-of-print books, where some latitude could be allowed. It wouldn't be hard hard for Amazon to see that the book is still in print.