While they do end with pushing their product, I think they did a good job of outlining how they scrape the recipes. They inform the reader about json+ld, microdata, and how to scrape the sites that don't use those. They even link to a JS lib that handles the parsing for you. I think calling it "just an ad" is inaccurate.
> There are libraries like https://github.com/digitalbazaar/jsonld.js/ to parse JSON-LD + Microdata for you.