I think homeboy here in the video is adding a few extra steps, but it's the basic process. I just checked youtube, there are a ton of videos that cover this very old method of making etched brass plates. There are no less than ten other ways to do this. Vinyl cutting, grease masking, masking pens, photo etch masks, decals, even iron-transferring toner from a laser print. You can electro-etch, or acid etch. It's like, how many ways can you count to work a concrete pour? It's been done for hundreds of years or more. Just like plate etching.