New email enhancements allows you to viewHTML messages, add multiple email addresses to your contacts, and easily search your messages using the new search feature.
Even though the sensitive information was hidden in the HTML and not visible in plain view, the Google crawler observed it and recorded the information to put into its search index.
Simply put, the model is the data (and by extension the HTML content of a website or app), the view is what you see on the screen (defined by the CSS styles of the user interface) and the controller is the logic that ties the two together (often expressed as the JavaScript or other interactive programming).