His formula is a prediction for next year based on the advanced stats, and factoring in injuries.
But Ottawa's actual advanced stats last year were merely above average, not excellent.
Of course, the underlying assumption of his analysis - like most other advanced statisticians - is that they for some reason assume that shots for and against will stay constant from year to year. It's a bizarre assumption, to say the least.
While losing Spezza and Karlsson, the Sens increased their shot differential from -0.6 to +1.9. For some reason, this is assumed to be absolutely sustainable, while the shooting percentages are not. The Sens improved their advanced stats while losing Spezza and Karlsson - why wouldn't we assume their advanced stats would get worse when they return? sure seemed to when they returned in the playoffs, at least.
Leafs dropped from a -2.5 shot diff team to a -5.9 shot diff team, but scored more and gave up less. Does anyone actually think the Leafs played worse last year than the year before?
Pens led the league with a +6.5 last year, and dropped all the way down to +0.7 this year....yet went from a 108pt team to a 123pt team, even with Crosby and Malkin injured.
The 'advanced statisticians' have taken a very small edge for shot-based metrics over goal-based metrics, and even though that edge still does not actually correlate strongly with results (though indeed, slightly better than the goal-based metrics do), they have somehow assumed that shot-based metrics are actually stable and consistent and predictable, when they are anything but.
Useful stats, but the mindset that shots for/against are stable, and goals for/against are merely luck-based variations that inevitably regress towards the shots metrics, is entirely wrongheaded.