It is advice for how to add headers to source files, not legal advice. This is a generic concept and the headers could literally say anything. They just happen

It is advice for how to add headers to source files, not legal advice. This is a generic concept and the headers could literally say anything. They just happen to be license and copyright notices, since that is what he needs them to be. It is easier than opening each file in a text editor to manually add the header.