The video mentions that September 15th is the date when China's national gate truly began to close, and many people found themselves encountering various problems when trying to leave China, with some even being prevented from exiting. The author's friend, who originally planned to leave China in October, is worried as this date approaches. The video speculates that non-US citizens might face the risk of being intercepted when leaving China after September 15th, with various absurd reasons, but due to it being a powerful nation, individuals are powerless to resist.