Says who?If you already own a PS4 you.. don't? Those are marginal sales (upgrades). But if you are in the market for a PS4 then the 10k¥ more expensive one will factor into the decision.
People going to buy a PS5 without having owned a PS4 in its first year are going to be few and far between so Ryza and DQ11S aren't going to entice them to get one
There's clearly a lot of people who upgraded from the base PS4. In fact everybody I know who owns a PS4 Pro had a PS4 prior.