Eli says that moshe is a "past master in the art of making himself insignificant, of seeing invisible" How does this skill backfire on Moshe later in the chapter?

Nobody believes Moshe when he insists that they are in great danger. Moshe has seen the holocaust coming to Sighet. People, however, had stopped paying attention to Moshe a long time ago. He is seen as an eccentric old man of little consequence.