How does the author describe the story of Mo Chi? Does he think Mo Chi was copied by Wang Xizhi?

This paper narrates the reason why Wang Xizhi practiced calligraphy so hard that the surrounding water pool was completely black, and the reason why Wang Sheng asked Ceng Gong to write Mo Chi, and expounds the truth that only by studying hard can you gain something. Wang Xizhi wrote it and dyed it in a pool of water.

When Wang Xizhi was young, he practiced calligraphy very hard. It is said that he practiced calligraphy with a broken brush and piled it into a hill, which people called "Pen Mountain". There is a small swimming pool next to his home. He often washes brushes and inkstones in this pool. Later, the water in the small pool turned black, so people called this small pool "Mo Chi".