Let's say a buyer has bought the last unit of a product.
Then this product in stock quantity is set to '0' automatically and then disabled from listing.

I find I can't even view this product page by visiting its url directly now.
I am wondering if the buyer can view that page?

If the buyer can't view the product page he bought, he is not able to check what exactly he has bought but just a product title.
Because the title alone can't tell what product it is, there should be a list of other features in the description.