Quick SB question why would you use a footprint with “will not post"

in it ? I saw a old thread on here and the poster said one trick was to use a custom footprint like the one below

“August 20, 2012” “powered by wordpress” “will not be published”

I get the date /wordpress portion, but why would you use the “will not be published” part ?

When scraping Google will only return results that contain the phrase in quotes. Such as “will not be published”

because if a post contains the phrase "will not be published" it means it contains a field "your email address will not be published" which means it is open for commenting.