Much better if he had waited for my «Historic
variations in arctics ice part 3» which goes into the period he is covering but is more thorough, as such places as the Scott polar institute has a valuable archive and library Where the real world data missing from his study, such as extensive russian material, can be seen.
I guess he doesn't know (or doesn't say) that his corporate sponsors are using the ongoing
decrease in arctic ice as a reason to explore more drilling sites in north polar waters.
That was a major motivation to predict a significant positive
shift in arctic ice extent for this September.