I'll try to make sense of this.
Copyright gives the author different classes of rights.
Most of these pertain to allowing others to use the copyrighted work, e.g. licensing. In a work for hire, the author (natural person) assigns this to whoever hired him (e.g. his employer)
But in Europe (but, I believe, not in the USA), there is a non-transferable moral right on fathership (rough translation for vaderschapsrecht), the right to let the world know that you wrote the code. This right cannot be assigned to someone else. So if a European employee works for Microsoft, and writes a driver for Linux, the employee probably has the right to require his name to appear in the copyright message.
It seems this article tells authors to not claim this right and remain anonymous.
How this hinders GPL enforcement isn't clear to me. It might muddy the waters about who owns the code right now, hence removing standing - You can't generally sue someone for infringing a copyright that is not yours, the current owner has to sue.