It should be noted, the methodology of this looks pretty flawed to me.
A lot of the multipliers seem to be notional. Why is Canadian airspace twice as safe as Nigerian airspace? Why not 10 times, or 1.8473 times?
The only significant factors are accident record (and 'accident' is not defined), fleet age, and fleet mix (reflecting superior type safety for some aircraft over others).
All of the other factors are pretty much identical for US/Canadian/Western European carriers, which makes the whole list look a little less credible.