This is a graph showing the drop in Search Engine (Google) ranking for your Century of Enslavement video on Youtube for keywords:
You can see that the levels have dropped off hugely this year.
However, it is still the case that when people search for 'federal reserve documentary' in Google's main search, your video is the #1 returned video:
And actually in youtube too:
So either this decision to remove this documentary from the results is regionalised or has been reversed since you looked into it @corbettreport.