This is a KiCad project and Gerber files for Pong Composite Video replacement PCB, as featured in the original Dave's Garage episode.
In theory you should be able to order a board from JLCPCB using just the Gerber files (specifically, the already-packed 'Archive.zip' in the Gerbers folder). Or you could use KiCad to load the project and generate your own Gerber and Drill files.
A list of the components that need to be soldered onto the PCB is included in PARTSLIST.md. A list of other components is included in the video description on YouTube.