I don't really understand the thing about computers writing code and this resulting in less demand for programmers. Don't computers already write a lot of code

I don't really understand the thing about computers writing code and this resulting in less demand for programmers. Don't computers already write a lot of code in the form of compilers, frameworks, preprocessors etc.? Seems that these technologies only make demand go up. If anything, code generation is the worst option out of any form of code reuse and results in code that is entirely unmaintainable. Code generation is often a sign of a language that handles abstraction badly, like Java. I can imagine some form of ai that instead o being trained to recognize images etc., is trained to present an interface. However this will likely be deathly slow and require custom code for anything custom anyway.