I do not agree with this at all, and just sounds like a bull&%$£ excuse to me.
Trying to promote the viewpoint that "it is better for some things to remain unknown" is not an acceptable one for a computer game of this type (or any type really). Usually this approach is used in other media forms such as books, TV, or films, and the majority of the time it occurs then is because the writer (or whatever) created "a mysterious thing" but without any idea or plan on how they would explain it. And when the time comes to explain it, they will often use the tried and tested "we left that mystery unresolved because we think it is better if some thing are left unknown" excuse as a get out of jail free card, and hope the reader/viewer will accept that as an answer to "the mystery". Sometimes the reader/viewer will accept this, sometimes they won't (as an example, see the polarised opinion of the Lost finale)
But I don't see how this view is possibly acceptable for a computer game. The developers can not claim that they wrote themselves into a corner and so therefore need to look for excuses due to not being able to explain how the mechanics work or what the formulas are, because the answers are right there is the source-code. All they have to do is check the source-code and provide the answers required. There are no mysteries in the game that can not be perfectly answered by the developer checking the source-code because nothing can happen in the game, mysterious or otherwise, without the game obeying the source code. Therefore any and all answers can be had from the source-code. There are no unexplainable mysteries, and therefore no excuses for them existing, and you can not use excuses from other forms of media and expect them to apply to a computer game, because they don't.
If some people prefer to be blind and totally ignorant of the specific formulas and mechanics of the game then that is their choice, but only THEIR choice, and this choice should never be promoted as a better approach, only a personal one. And it should NEVER be a choice forced onto the player by the developers, and certainly not a choice that should ever be trumpeted (which seems to be the case with this article) and promoted as a positive of the game. Since in reality it is simply a poor excuse that is being used to explain the reason why the proper formulas and mechanics are not made available to those players who wish to know them. The lack of this information is a bad thing, not good.
If the developers can't be bothered to invest time and effort into assisting the person writing the game manual (by way of checking the source code for accurate formulas and mechanics), then that can only be seen as a negative point against the developers. And it is certainly wrong to promote this as being a good thing, because it is not, and also because the lack of such information can cause huge amounts of frustration and alienation of the player base consisting of those who want to be informed players, and not ignorant ones.
Not all players want to play with their head in the sand, and if they are forced to by the developers (by way of them not providing accurate information where necessary) then the developers should be called out on this point and a black mark recorded. They certainly shouldn't be given the luxury of being able to hide behind an excuse that in no way applies to a computer game.