Google's Danny Sullivan told us that the Google product reviews update primarily evaluates product review content on a page-level basis, but not always. Danny added "for sites that have a substantial amount of product review content, any content within a site might be evaluated by the update."
Danny wrote on Twitter "the product reviews update works primarily to evaluate product review content on a page-level basis." "However, for sites that have a substantial amount of product review content, any content within a site might be evaluated by the update," he added. He also said "If you don't have a lot of product reviews (a really substantial not-single-digit-percentage part of your entire site is made up of them), a site-wide evaluation is not likely to happen."
This comes after some confusion online about how the product reviews update works - which makes sense based on how Danny said it can work both on a page basis and sometimes goes on site-wide.
Here are those tweets:
If you don't have a lot of product reviews (a really substantial not-single-digit-percentage part of your entire site is made up of them), a site-wide evaluation is not likely to happen...
— Danny Sullivan (@dannysullivan) October 7, 2022
Also, Google said it may use structured data to help determine if a piece of content is a product review or not.
Forum discussion at Twitter.
Note: This was pre-written and scheduled to be posted today, I am currently offline for Succos.