Vegas finished 10th in PDO last year, their PDO was completely that's hardly unsustainable
I just went back and checked, you are right. They were above average (100.5), but not by much. I remember looking at it before and seeing it higher, but maybe that was earlier in the season before it normalized. Oh, and William Karlsson's absurdly unsustainable 23.4% shooting percentage last year. If he gets more than 30 goals this year I'll eat my hat.
This statement is more accurate: The worst PDO for any team since it was a tracked stat (07-08 season was the first), not including the shortened season, was the 16-17 Colorado Avalanche at 96.6. That year the Avs had the leagues worst shooting percentage at 7.2% and the leagues worst save percentage at 0.894. Their record that year was 22 wins and 56 losses for 48 points. The Sharks PDO over 3 games is more than 3 times further from the average than the Avs of that season (3.4 vs 11.7). Their current rate is a statistical anomaly and will correct itself over the next few games. To think it wouldn't would be the same thinking as if you flipped a coin three times and it landed heads all three times so you assume you will always continue to flip heads from then on.
A fun math experiment was this hypothetical: What if their shooting and save percentages were reversed? The Sharks have 101 shots for, 5 goals for, 4.95% shooting percentage, 66 shots against, 11 goals against, and 83.3% save percentage. If they had 101 shots for with 16.7% shooting, they would have ~17 goals for. If they had 66 shots against with 95.5% save, they would have ~3 goals against. If you saw a team win their first 3 games with a goal differential of 17-3, the first thing that comes into your head should be "unsustainable". Unless you think 465 goals for and 82 against sounds reasonable after 82 games!