PDO doesn't describe luck much at all, perhaps a bit in the short term. Over longer periods of time, good teams will have a higher PDO, and bad teams will have a lower PDO.
Also, that the league wide PDO must be exactly 100 is false. You would have to remove empty nets goals from shooting percentages for this to be true. An empty net goal creates a bump up in shooting percentage, without a corresponding bump down in the other teams' save percentage.
It's perfectly sustainable for a good team to have a high PDO. That's why they are good, because their goaltending is above average, and their scorers are above average.
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