Search engines are really smart. They can identify the main content from your page and disregard irrelevant content.
Hawkeye uses a number of ways to identify your content on your page before making the analysis. It basically identifies the main content on the page and all other content not related to the page is stripped from the analysis.
If you want to decide for yourself what content should be part of the analysis you can configure this. See how you can configere Hawkeye here
Hawkeye analyses your draft in your Sitecore CMS which means that you do not have to publish your content with the possibility of a bad ranking on search engines before you can analyze your page.