I like this answer. I like it because it does, in fact, illustrate the legal parameters of what is public information. It hangs on the phrase "some arcane corner somewhere." Not all information that is available on the Internet is public. To be public it must be easily accessible and/or intended to be public. In other words, just because somebody gets mad and doxes me doesn't mean that information is automatically public, even if it shows up as such. On the other hand, if I make no attempt to keep some information private -- perhaps my phone number -- but make it readily available from my personal web site (visited by only myself but accessible to anyone), the "arcane corner" in which I publish it, is not a legal protection against it being considered public. The "sticking point" here is the question of a 3rd party gathering information and publishing it. Since Inno allows the data mining and considers the information put out by elvenstats to be public (which we must assume since they fall under the German laws which are stricter than American), then we have to consider those playing the game have given their permission to give that data out since it is given out through other means within the game. In other words, it's not the obscurity of elvenstats (in the grand scheme of things they are very obscure to anyone know playing Elvenar), but the fact that they are giving out information the game developers consider public and which anyone playing the game can access.
So can we easily access the chapter a player is in? We can go to their city, look around, and in most cases take an educated guess. And most of the time we would be right. Does that mean our guesses can or should be confirmed and improved by Inno through the mechanism requested here? To be honest I don't know. I suspect it would be okay, but lawyers are tricky and when they get involved you don't even know what the meaning of "is" is.
AJ