I think the Hartley 3rd period comebacks were driven partly by early goalie pulls.
The big variable is it assumes that pulling the goalie at 5:40 to go has the same probability of scoring per minutes as with 90 seconds to go. This is not a valid assumption as strategies will change as people start pulling goalies early and you end up with a third line shift pulling that early instead of just 1/2nd line shifts.
That said I think the statement that goalies are pulled to late is valid in the same way that teams don't go for it enough on fourth down.
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