It's a con trick by the BBC.
No-one wants DRM on the BBC's broadcasts; not even the BBC themselves. But many content providers, especially American ones, are trying to insist on it. So the BBC have devised a very clever way to con the content providers.
The trick is to put DRM into the broadcast version of the program guide, that tells you what is on when. This was announced with great fanfare as "the BBC is adding DRM to its broadcasts", with no mention of the small technical detail that the actual video and audio will have no DRM. So the content providers think that they have got their way, but there will be no impediment at all to (for example) capturing a broadcast off the air and making a torrent out of it. Articles like TFA are part of the con: they help convince the content providers that they have got what they want, which in turn induces them to sell stuff to the BBC that we might otherwise not see.
The commercial set-top-box manufacturers don't care, because they have to cater for genuine DRM on the commercial channels anyway. And the hobbyists who are running software such as MythTV don't care, because they download the program guide from the BBC website, which conveniently provides it in machine-readable form with no DRM.