There was nothing unusual about that script. That's how you do it. There was a "script guru" back in the early '00s who made the argument that every single first draft that had ever been written could improve simply by ditching the first 30 pages. Beginning writers have this urgent need to explain all the cool shit they've thought of and hang up all the bangles and shine all the sparkles and backstory the ever loving fuck out of the poor dumb bastard making $15 to read this thing and write 1000 words on why it sucks and they don't realize that THE AUDIENCE OWES YOU FUCKALL. Then you get into novels and shit is even more brutal: The rule William Goldman, Blake Snyder and Syd Field all used is "you have ten pages to hook your audience." The rule Sol Stein uses is "they're going to pick your book off the shelf, open it, start reading the first page and if you don't have them hooked by the time they flip to page two you lose." Star Wars - the whole fucking thing - is "He fought with your father in the Clone Wars." Someone once wrote JRR Tolkien to ask what lay beyond the mountains of Mordor. He wrote her back to say "madam, if I told you, you would simply ask 'well what lays beyond that?' What is important is that I know what lies beyond the mountains of Mordor, not that you do." There's a five page document that goes with that script. It lays out the next nine movies. It was created at the request of a collaborator. I fuckin' well know that world but nobody else needs to until there's a story happening in it.
There are a lot of authors out there who publicly talk about what they want writing to be, not what writing is. Mr. "sit at the typewriter and bleed" tried out 26 different titles for A Farewell to Arms, finally settling on number 12. There is science to it, and there are methods that make you more successful, but they tend to be unfun. I've beta-tested for Final Draft for like fifteen years now and there was a time when they'd tell you that the "want to be a screenwriter" market is substantially more lucrative than the "screenwriter" market but since that's bad for business, they keep it on the downlow. Multiply by every other creative profession.