They are copying Microsoft at everything else, they may as well copy them at 'sold through' and 'sold in' shenanigans.
PS4 numbers are sold to customers
PS5 numbers are..?
So your thesis is that retailers have tens or hundreds of PS5 consoles sitting on shelves or warehouses?
Past volume numbers like 20 million units / year, what do you think the percent difference between shipped and sold to customers will be?