It is outdated, and sorry for any confusion. I'd recommend instead following the old quickstart for the course, as it's closer to what's covered in the course
Ensure you have Node and npm installed, then follow the Clone section. Do note this is now deprecated, and the current cli-based (command line interface based) quickstart is what's used.
Even within this older quickstart, files are organized differently. To get started with the code in the first video in the course, delete the contents of the resulting cloned respository's app/main.ts and delete all is existing code, replacing it by the contents used in the first course video's main.ts.
Please let me know if you have any other questions!