Itnab requires a real gain: clarification, reinforcement or another purpose suited to the context. Length lacking such a gain is not eloquent amplification.
Tatwil: needless enlargement in which one cannot easily isolate which of several redundant elements should be removed.
Hashw: a plainly superfluous word or phrase that can be removed without loss.
In «وَأَلْفَى قَوْلَهَا كَذِبًا وَمَيْنًا», the near-synonyms “falsehood” and “lying” would be redundant if no further effect were intended. Synonymy alone, however, does not prove a defect: repetition may also be purposeful emphasis.