MDRAM's talking about letterboxed programming. Shows that were shot in widescreen, but there are no HD masters available.
And he/she's right...they should be upconverted. They wouldn't be stretched, they would be zoomed. You can do it yourself with your TV or STB, but they have much better upscalers than we do, and it's ridiculous that they don't do it.
I've experimented with this before...loaded some anamorphic DVD material into Premiere Pro and upscaled it with Red Giant Instant HD. The result was much better than just zooming.