This is a pretty shallow analysis of his point. His point is that insofar as it related to the privacy of propagating keyword information, the action of a user

This is a pretty shallow analysis of his point. His point is that insofar as it related to the privacy of propagating keyword information, the action of a user clicking an ad or an organic search result doesn't seem any different. If the keywords a user searches for is private information, then why should this privacy be off the table when they click on an ad?