What does it means when someone cannot find a specific webpage by
site: in Google?
The page was indexed by Google earlier but cannot be found even with
site: operator. What will that mean?
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It probably means the page is no longer indexed. This could be due to penalties applied since the page was first indexed. Google is constantly applying quality control updates to their algorithm (commonly known as Panda and Penguin) which can have a negative impact on pages it considers low quality.