While there have been advancements in using Artificial Intelligence (AI) for tasks traditionally performed by humans such as creating art or content, there is currently no information or evidence suggesting that a supercomputer created the world's first AI-created film trailer. If any significant developments occur in this area, news sources and tech-focused media outlets would likely cover and provide details about them.

It's essential to be cautious when encountering claims about significant breakthroughs, especially related to cutting-edge AI advancements. Fact-checking through reputable sources ensures information accuracy and authenticity.