Google may hold the launch of passage indexing till early 2021. Danny Sullivan made it lear by telling that Google has not rolled passage indexing yet. It was expected to roll out by the end of 2020.
It is not.
— Danny Sullivan (@dannysullivan) December 23, 2020
Very specific searches can be the hardest to get right since sometimes the single sentence that answers your question might be buried deep in a web page. We’ve recently made a breakthrough in ranking and are now able to not just index web pages, but individual passages from the pages. By better understanding the relevancy of specific passages, not just the overall page, we can find that needle-in-a-haystack information you’re looking for. This technology will improve 7 percent of search queries across all languages as we roll it out globally.
Understanding Passage Indexing
Since it is named as “passage-indexing”, it is not an actual change in indexing but is more of a ranking change. Indexing is not really affected by it. It is based on how Google ranking works on content, based on your web page. Google is better at regulating the content on the page and using it for better ranking purposes.