I'm not sure, but it sounds like they mean that building and quickly searching an index has been democratized. You can now use any number of FOSS projects or SaaS offerings to do that, depending on how big you want the index to be and how much you want to spend.

That’s right. Back when google was coming to be, building a search index was basically computer science/grad school research territory. Now there’s tons of good starting points that you can throw money and hardware to scale quite a bit to at least prove out a product concept.

Which starting points are those? I'm familiar with some open source search engines, but not open source solutions for crawling and updating a search index of the web.