Why does [XYZ] appear in the Yoast internal linking metabox?
A related post appears in the Yoast internal linking metabox when the two posts have overlapping prominent words. To find overlapping prominent words, we compare the top 20 prominent words in the current post to every other post on your site. The more overlapping prominent words a post has with the current post, the higher its position will be in the internal linking list.
How Does Yoast SEO Find Prominent Words?
The plugin scans a post for relevant one to five word combinations while removing common or frequently used words and word combinations. We rank the completed list based on an internal score assessment and save a maximum of 100 words and word combinations. However, we only show the top 5 prominent words in the Insights metabox.
If you’d like to learn more about how the internal linking works, please read this article: Yoast internal linking: the making of