What does "Immutable base OS" mean?

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I’d say that both phrasings are ok:

  1. KDE Linux is the OS but it has an “immutable base”, therefore it is an “immutable base OS”, just like when a dog named “Fuffy” has only “three legs” we can say that «Red is a “three legs dog”».
  2. If it can be said that KDE Linux is more than an OS because it is shipped with additions that do not belong to the definition of OS, it can be said that a part of KDE Linux is an OS that is “immutable base”, therefore «KDE Linux has an “immutable base OS”».

I prefer option 1, because A) the premise of option 2 can be falsified and B) we often equate things to their most prominent part, just like we call Fuffy a dog even if it misses one leg.