As we can see from the level of fear and the level of respect that the servant shows to the emperor in the quotes " No, no, a miracle!" said the servant, bowing quickly." which shows that he his afraid of the emperor and what he will do to him and shows that the emperor is a figure to be feared and reigns with an iron fist over his subjects which is an aspect of dystopian fiction.
From the quotes "Tell me," he said to his servant, "has anyone else seen this flying man?" we can see that the emperor is slightly paranoid and jealous of the flying man and has been corrupted by power and will do anything to keep it, this also further shows an aspect of a dystopian society.
"The flying man alit with a rustle of paper and a creak of bamboo reeds. He came proudly to the Emperor, clumsy in his rig, at last bowing before the old man. "What have you done?" demanded the Emperor." Which shows that the emperor is angry at not being treated respectfully by one of his subjects which shows that normally he commands utter respect from his subjects.
The way the emperor immediately calls for the executioner tells us that he is paranoid and will not release control to his subjects
In the end, the society in the Flying Machine is a perfect example of a dystopian society in dystopian fiction.
The garden and the mechanical birds try to seem like a utopia with a serene sort of air to it, dystopian societies try to fool their population into believing that they're living in a utopia like how this garden tries to fool people that it's a utopia.