Adding empty values

The plugins “works” perfectly as it removes Genesis theme Schema.org structured data markup.

However.

Plugin adds “empty” values on html elements in the form of xxxxxxxx on blog posts and pages.

E.g. when viewing source-code the plugin adds:

itemprop="xxxxxxxxxxxxxxxx" role="xxxxxxxx" itemtype="xxxxxxxxxx"

Why is it doing that, is adding xxxxxxxxxx necessary?

https://wordpress.org/plugins/schema-removal/