As far as I can tell the article has been misinterpreted causing much lost hours by HN commenters. By saying users don't care about your tech stack, it is saying you should care about your tech stack, i.e it matters, presenting some bullet points on what to keep in mind when caring about your tech stack. Or to summarize, be methodological, not hype-following.

Agree the article is not clearly presented but it's crazy to see the gigantic threads here that seem to be based on a misunderstanding.