They don’t do this on Fire TV app either.
However, on the Samsung TV app for the Tablo v4 they show the episode descriptions. It’s one of the things I noticed when the Samsung app was released and asked them to bring this feature to other platforms.
When I select a recorded show on the Samsung app, it brings up a right-side slide-out menu screen with the recorded shows listed, but it displays them in chronological order without any watched or new indicators on the episodes. However, when I select a show, the subsequent right-side popup menu includes the episode’s description. It also includes an extra menu option for either ‘Mark Episode Unwatched’, or ‘Mark Episode Watched’.