Google paper - can we trust this Google paper?

When this Google paper info came up in the video, I paused the video and my attention went to the ‘Delete cookies’ bar where approx. 1-2% experts prefer deleting cookies. We know that cookies most of the time track us to throw ads and our privacy is somewhat compromised. In this scenario, how can we trust this Google paper considering the fact that Google uses cookies to gather users’ behavior so that they can throw targeted ads?

The cookie result would be based on the fact that deleting cookies has little effect of preventing hacking. Which is more what the paper is about - Security. But as you point out cookies play a role in tracking you which we cover in great detail throughout the course series.