"When Linux is used as GNU's kernel, Linux is a part of the GNU operating
system."
No, that's simply not true. Even RMS never claimed this.
Linux replaces a missing component in the GNU Operating system.
Therefore, the operating system as a whole is called "Gnu+Linux".
You're misinformed.
> If a soldier named Gilbert loses a limb and gets a prosthetic called Limbux
added to his body, it would be incorrect to call him Limbux (unless he
decided to change his name). He's still Gilbert. The new limb doesn't change
his name.
I read this quote on science or nature:
"Metaphors are like cheese. Very desirable, but sometimes full of holes!"
In this case, we can't compare a human and a technical thing.
We treat humans completely different. You call Gilbert still Gilbert because
he has the same personality, the same soul, if you like to.
A technical thing like a car doesn't have a human personality.
If you buy a ferrari and replace 50% of the devices in it with ford
components, is it still a ferrari?