Yes, central banks buy government bonds from commercial banks but that is irrelevant. The commercial banks effectively act as pass-throughs. They buy government

Yes, central banks buy government bonds from commercial banks but that is irrelevant. The commercial banks effectively act as pass-throughs. They buy government bonds knowing that they'll immediately offload them to the central bank. The way money printing works in the modern economy is much more complicated than it used to be, but it boils down to the same thing with the same problems.