Literally the next sentence:

The matching document type (in this case, PDF) will subsequently automatically trigger Google Gemini for all future files of the same type opened within Google Drive.

So documents you didn’t tell it to look at.

The pharmaceutical industry spent $700 million lobbying against this? What a bunch of assholes.

https://www.businessinsider.com/facebook-papers-mark-zuckerberg-frances-haugen-leaked-docs-2021-10

Thanks for the hard work!