Awesome, thanks. So N-back is not likely a useful method. Therefore this article misconstrues the scientific evidence regarding training.

The article was written in 2011 before many of the follow up studies questioning Jaeggi's initial findings were published.

While I think the evidence available today had muddied the water relative to what people thought after Jaeggi was first published, not all avenues have been covered (e.g. do people in knowledge I industries who are more motivated to increase iq try harder and as a result achieve better results). In my opinion, if you can spare the time, there's little to be lost from trying n back training. If it does work for you, the upside is tremendous. Anecdotally I tried it and came up with novel solutions to problems I hadn't previously cracked within a few months of training.