As for determining the status of video games as a medium, we need to ask ourselves something.
How do we deal with instruction manuals? For physically-released video games, the manual often contains important information relevant to the story, but its purpose is usually to break the fourth wall in a non-intrusive manner.
The trouble, of course, comes in cases where characters/concepts are named only by the manual. This was often the case in video games before c. 1995, though I'm unaware of this ever happening within a potentially-valid Doctor Who video game.