There is a misunderstanding regarding the Results entry on the email. It is intended to be a link to the Google Forms results spreadsheet and not a copy of the responses the user submitted. The results argument was an optional parameter on the deprecated “gform” shortcode that it appears I never added to the UI when defining a Google Form within WordPress.
Because Google Forms can be multiple pages, the only way to include the results that the user submitted would be to store them all in memory and keep track of them across the various form pages until the form is actually submitted. Because each page of a Google Form is actually a separate form, it is a little tricky to carry all of the data around and make sure it is correct.
I don’t want to make any promises about being able to do this so all I can say is I can look into it when time permits but currently resolving the checkbox problem with newer versions of PHP is a much higher priority.