"Their platform and organization are made up of small teams that own services with well-defined interfaces, accountable for customer metrics."

You are using the terminology of products and platforms with the exact opposite meaning of the article's author.

Those "services with well-defined interfaces" become a platform others can use to build their own products. Similarly with the e-commerce and fulfillment infrastructure third party sellers can use. And maybe the transportation infrastructure in the future.

I also think you vastly underestimate the quality of Google's UX. Type any thing you can think of into one simple box, and you get surprisingly useful auto-completions, relevant spelling corrections, and almost always find the answer to the question you had when you started typing. There are any number of complex back end services working in parallel to resolve your query, with results gathered, ranked, merged, and rendered in a fraction of a second. Pretty hard to beat that user experience.

This is how the author defines product focus, emphasis on combining many components internally to provide an outstanding end user experience, without necessarily making the components available to be used by others to create their own user experience for their customers.