It for sure isn't money laundering.
They are out of stock, and waiting for new stock to arrive.
If they had the page marked as sold out, it would lose it's ranking in eBay search, and lose its place on Google Shopping and in other search results, thus reducing its visibility and traffic to almost zero.
So instead they keep it marked as in stock with a high price so nobody buys it temporarily, but then the page is still kept active and doesn't lose its place, ready for when they get more stock back in.