Past perfect use

Thank you very much. And the last question - please explain the use of past perfect "Investigations are powerful self-promotion tools for Navalny. A 2015 movie he made about Prosecutor General Yuri Chaika and his sons has been viewed more than 5.3 million times on YouTube. The freshly released movie explaining the Medvedev investigation had crossed the 2.2 million mark at the time of this writing. It will probably beat the Chaika one eventually". Where is the previous action or implied one?. Thanks