Seeks sets a demand value to your website. This is from the schema.org project which is written in conjunction with googles algorithms.
It was beneficial microdata but an update was made from your comments within a few hours to give the user an option to turn it on or off. However you continue to question.
There is no hidden code, the plugin is GNU General Public License, version 2. You have complete access to the source code and the code was approved by WordPress. Look for your self, don't install it, write your own plugin, get left behind, establishing correct microdata is the new Seo and this plug in does it. Just wait until version 2.0 is released.