Well, I'm not sure why the Dunyain would be discussing the No-god in terms of sentence structure?
Edit: perhaps it has to do with the way you are trying to apply first order logic here?
Remember that Bakker is a philosopher rather than a computer programmer.
Perhaps like the shared use of semantic logic by philosophers and programmers might be creating allegorical confusion because the No-god et al are supposed to resemble Turing machines?
I'd say that use of language is how we express our internal thoughts externally (we can also express things through music, art etc, but I would says this tends to be emotional rather than intellectual). We convey language through either speech or writing. Grammar provides structure for this, and hence plays a considerable role in defining meaning. As such, grammar and sentence structure is important in understanding what a speaker, and especially a writer is putting across.
Use of capitals for Subject and Object, tells us that they are proper nouns, i.e. named things, rather than more general concepts - in fact the Mutilated do actually tell us that the Sarcophagus is the Object.
In terms of understanding meaning I would say this of great importance, in trying to grasp the story Bakker is telling. The Sarcophagus is the physical component of the No-God. A sarcophagus, is a stone coffin. A literal translation of sarcophagus from Greek is flesh-eater or eater of flesh, i.e. a cannibal. This can than relate to Kelmomas eating people when hiding in the palace in Momemn, and also to the Ordealmen eating their fallen comrades. As to what the significance of this relationship is, I don't know.
There are plenty of other examples of words with more than meaning being used in the books, and I suspect used so deliberately in most if not all circumstances. Also, as I recall, in Earwa sorcery revolves around meaning. Grammar, as a word, comes from the same root as grammarie (other spellings are also available) (a medieval term for magic), grimoire and glamour.
Semantics is important, as is semiotics.