Well...
Usually games are set to be played and solved. There are of course exceptions and idiotic puzzles, but the fact remains that most games are... solvable, especially for someone like MaG who knows what they're doing...

The company's walkthrough (Ditr has one, which just came out and actually the walkthrough was online before the release of the game, which seems bizzare), sometimes serves other purposes. Walkthroughs come with plenty of spoilers usually. If one wants to avoid putting spoilers, he must go first, create the walkthrouh without the spoilers and set it online, so as to prevent other people from working on something which is already there (the walkthrough). Seeking controlled reactions I guess...