Actually, that screenshot is of FMC (Free Movie Classics), and this Free Movie Classics, not Family Movie Classics, is the channel showing Porgy and Bess, although incorrectly as you stated. (showing "The Last Alarm.")
They also have an Android app called FMC (Free Movie Classics), but is also showing the wrong movie. The Channel developer has an email contact at email@example.com.
Looks like the developer is currently doing some updating/developing as FMCTestWestern with No Ads is present in the Roku Channel Store, but FMC (free) is not showing, although I currently have it installed on my Rokus.
Click on Image to Enlarge.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102