I agree with the premise of the thread, I never heard of "pdo" this season and it really brings out a collection of people showing a poor understanding of math/statistics and the game of hockey.
First it's doing something that's just unnecessary, there's always been the concept of a career/contract year. Look at the career of any decent player and there will likely be a season or two that stands out above the rest. Second it's wrong in that it then tries to quantify and attribute this concept that's always been known to a "luck" factor.
Now luck will certainly play a part, but what's actually going on is a combination of coaching, chemistry, confidence, preparation, motivation, luck, and maybe a few other things. There's also the point where you have all this going on for a player that they begin to create their own luck. And a player 'reverting to the norm' is not so much a matter of luck evening out as it is every spring you hit a hard stop on the season and they come back with a full reset in the fall.
Andrei Kuzmenko makes a great example here and to drive the point home if him scoring 39 goals and shooting 27% last season, a good 15% or so above the norm, was really just "luck" then yes you can actually calculate that. I can't quite remember how to do the math, but it's not to write a quick simulation. I set it to 143 shots, an expected 12% shooting average, and run it a million times:
Goals: 2 Occurences: 1 Shooting % 1.4
Goals: 3 Occurences: 9 Shooting % 2.1
Goals: 4 Occurences: 32 Shooting % 2.8
Goals: 5 Occurences: 202 Shooting % 3.5
Goals: 6 Occurences: 571 Shooting % 4.2
Goals: 7 Occurences: 1617 Shooting % 4.9
Goals: 8 Occurences: 4156 Shooting % 5.6
Goals: 9 Occurences: 8633 Shooting % 6.3
Goals: 10 Occurences: 16269 Shooting % 7.0
Goals: 11 Occurences: 27640 Shooting % 7.7
Goals: 12 Occurences: 42865 Shooting % 8.4
Goals: 13 Occurences: 59980 Shooting % 9.1
Goals: 14 Occurences: 77181 Shooting % 9.8
Goals: 15 Occurences: 91467 Shooting % 10.5
Goals: 16 Occurences: 100161 Shooting % 11.2
Goals: 17 Occurences: 102867 Shooting % 11.9
Goals: 18 Occurences: 98665 Shooting % 12.6
Goals: 19 Occurences: 88620 Shooting % 13.3
Goals: 20 Occurences: 75906 Shooting % 14.0
Goals: 21 Occurences: 60543 Shooting % 14.7
Goals: 22 Occurences: 46238 Shooting % 15.4
Goals: 23 Occurences: 33838 Shooting % 16.1
Goals: 24 Occurences: 23431 Shooting % 16.8
Goals: 25 Occurences: 15214 Shooting % 17.5
Goals: 26 Occurences: 9946 Shooting % 18.2
Goals: 27 Occurences: 5937 Shooting % 18.9
Goals: 28 Occurences: 3609 Shooting % 19.6
Goals: 29 Occurences: 2057 Shooting % 20.3
Goals: 30 Occurences: 1166 Shooting % 21.0
Goals: 31 Occurences: 589 Shooting % 21.7
Goals: 32 Occurences: 284 Shooting % 22.4
Goals: 33 Occurences: 175 Shooting % 23.1
Goals: 34 Occurences: 61 Shooting % 23.8
Goals: 35 Occurences: 45 Shooting % 24.5
Goals: 36 Occurences: 9 Shooting % 25.2
Goals: 37 Occurences: 9 Shooting % 25.9
Goals: 38 Occurences: 5 Shooting % 26.6
Goals: 39 Occurences: 1 Shooting % 27.3
Goals: 42 Occurences: 1 Shooting % 29.4
For Kuzmenko to have scored 39 goals last season on luck alone with this season being a return to the norm, you are literally getting in the range of 1 in a million odds. That is still certainly possible, yet doesn't hold because every season there's a handful of players with an especially high s% that if you attribute it to purely luck would range in the 1 in 1000-100,000 range.