Advertisers/Ad Measurement Companies: We may share information collected from or about you with Advertisers and/or Ad Measurement Companies to select advertisements, and measure and improve advertising effectiveness. As a reminder, please see the Information from Other Sources section above if you have questions regarding the role of Advertisers or Ad Measurement Companies.
This site says Netflix tracks 0% of your data. If that were true they'd have no clue who watches what. Something is fishy.
It says that Netflix doesn't share data with third parties, it could be they just use the data they collect internally to recommend more content
From https://help.netflix.com/en/legal/privacy
They're definitely sharing the info externally.