My main confusion was with the claim that one person did an entire "opening sequence" of a major film. That's simply not possible. It's like claiming a skyscraper was built by one guy.
Not every film is a Marvel movie. Many films use VFX even if it doesn't look like it. The opening sequence could have been for a romcom or something that only needed a bit of light work to touch up some frames or remove a wire or something.