The results in the article are slightly skewed. They are presented with a "space" between "site:" and "domain". For example, "site: plos.org" has advanced at 86

The results in the article are slightly skewed. They are presented with a "space" between "site:" and "domain". For example, "site: plos.org" has advanced at 86% and "site:plos.org" has advanced at 71%. It looks like the difference is the "spaced" form is doing a document term search and the non "spaced" form is doing a site search.