What kind of episode title is "The Polio Crusade originally aired in 2009"

​I'm serious; that is not an IMDb episode title. If it is not already in IMDb, it should be added to the correct season in 2009.​

​The problem is that it already exists in IMDb:​

​https://www.imdb.com/title/tt1347564/?ref_=ttep_ep2​

​episode 21.2, aired 2 February 2009.​

​For the offending episode:​

​https://www.imdb.com/title/tt23456754/?ref_=ttep_ep_cur​

​I submitted a merge by the standard procedure of submitting correction of episode title and number to match the original episode.​

​Here is my accompanying "Explanation:"​

​This episode indeed premiered in 2009 and it is already in IMDb. I am submitting this as a merge.​
​Here is PBS American Experience page with "The Polio Crusade" listed as Season 21:​
​https://www.pbs.org/show/american-experience/​

​I submitted this back on November 19​

​#221119-061813-208000​