I'm well aware of the pros and cons of mutability. I object (hah!) to this novel new use of the word "object". The concept is well defined by the ECMAScript spec.
Your first link's first sentence's first two words are "Immutable objects". No problem there. It doesn't conflate objects with mutability.
Your first link's first sentence's first two words are "Immutable objects". No problem there. It doesn't conflate objects with mutability.