What's wrong with killing their own product? It's not like it's a child, it's a product line. When it no longer serves a purpose be done with it.
The PS4 Pro was designed for those who wanted the best graphics available... That market now is better served with a PS5 or Series X. I could still see a function for the PS4 Slim as a low cost entry point, but the Pro doesn't really serve a purpose anymore.
If they want to kill the PS4 why are they still developing flagship titles for it them?
Seems like a very confusing message.
Because there are already 100 million people who own a PS4. Just because you don't really want to make aggressive efforts to sell more PS4 hardware doesn't mean you stop selling software.