More than 10 in stock.
2021 Model. Reportedly better than the 2022 model - https://www.rtings.com/tv/tools/compare/sony-x90k-vs-sony-x9…
Could be a runout of old stock, could be customer returns. Out of stock in the regular sony site. - https://store.sony.com.au/archived-television-4K-X9000/XR75X…
It has been speculated Sony use the ebay seconds to clear old stock to not devalue the product.
I bought one a few months ago. Was definitely new. YMMV
For reference
Current retail price - $2,995.00
Good Guys Commercial - $2461.00
Can vouch for sony 2nd's products, got a 65 inch A80J recently from Sony Ebay and had no issues at all so far