Until it automatically knows when and how it's wrong, you'll still need a human to figure that out, and that human will need to actually know how to program, without the overgrown auto-complete.
May or may not reduce the demand for programmers, though. We'll see.
But that's exactly what you are doing as a programmer who uses it. If you autocomplete using it and then fix the code, you are literally telling it what it got wrong.
I was responding to "It could start to replace us in 20 years." I think if it can do that, it'll basically be AGI and a lot of things will change in a hurry. I don't think that a tool that can do that is even all that similar to this tool.