I suspect this will be one of the significant weaknesses in trying to translate anything learned in a game economy into real economies. You have much better data in a game economy, but people do grow bored or decide they're just not good enough, and move on. Or people decide they've taken a stupid path and reset their account, and build from scratch. In real life, most people try to keep living even if they're at the bottom end of the economy and don't have the means to change that. This strikes me as a fundamental difference between the virtual and the real.

With a good team of people who know SQL, he can pull data from any population he chooses, and can make any statement about that population he has data on, and if his arithmetic is valid, those facts are without any sort of 'noise'.

On the other hand, this is economics, and if he ever wants to make a valid prediction, he's going to have to use forecasting. Forecasting intentionally adds noise, so in that sense, have the population doesn't eliminate the existence of noise in his work.

But I really don't see what you mean by 'noise' in this case. He literally has all of the facts. There is nothing fuzzy about the data, as long as he has the data.