"Why decieve myself? Isnt it obvious to everyone but me that im dying, and that its only a question of weeks, days... it may happen this moment." We can tell this because hes saying that he can die anytime soon.
Moshe is awkward, clownish, shy, doesn't talk much but sings, deeply spiritual, very poor, and the community likes him. Are there any options to choose from? One critical way in which Moshe is important to both Eliezer and the people of Sighet is because of his symbolic meaning.