as i mentioned in another thread, luffy referred to laws presence after he was shot in dressrosa as "voice" too. So aisa and coby talking about "voices" doesnt necessarily mean they are "hearing".
In the case of sanji in this chapter, the way jinbe and luffy seemingly didnt perceive any of this makes me think this is CoO related
but who knows, maybe i handed that W to
@Chrono -chan a little early. . .