He's comparing Google Searches of NodeJS (a language) to Google Searches for Rails (a framework). Technically speaking this is a huge flaw. Pragmatically speaking the author doesn't critique the strengths or weaknesses of why Rails would be a weak choice. His opinions are weakly based solely on popularity. Rails and Django are incredible powerful tools given for a very particular job. Node is another beast entirely. It's tooling and strengths are completely different because they both have different use cases.