Yeah he has certainly benefitted from that PP time, and he was incredibly lethal PP weapon with a healthy wrist.
5v5 he needs to improve (so does the whole team), but his scoring efficiency didn't really drop off that much from last year - he only had 3 less 5v5 points in 3 less games this year despite his shooting percentage dropping from 14.6% to 8.9%.
Breakdown of his 20 point drop:
8 less PP points (9 less PP goals)
4 less EN points
3 less 5v5 points
2 less other ES points
3 less SH points
So it's pretty much just PP shooting and EN points that make up the majority of the difference between this year and last.
I use EV strength and PP seperated mostly so empty net points tend to be completelt ignored by me, as I view them as mostly flukey. (shorthanded points are also pretty flukey, and I don't like to give credit to guys getting PK points if they give it all back the other way.
NYI is a good example of that PK last year. Sure, they finished 3rd in the league in goals/60 on the kill (1.75), but also gave up 10.69 goals/60 on the kill, dead last in the league.
I like to use net differentials to try and evaluate PK performance (it's not easy, and a lot of PK stuff does unfortunately become somewhat narrative/reputation related)
Stutzle's EV production dropped, especially in primary points where he went from 1.95 to 1.41 per 60.
The PP aspect may have something to it, but again, his primary assists also cratered there (how much of this is due to the loss of high level PP weapon Alex Debrincat)
I like Stutzle, I have him in the same tier as Nico Hischier. I simply think he's a step down from Jack Hughes.
I also think pencilling him in as a guarantee to be better than the 1 truly high level season he's had isn't a sure thing.
If he plays up to his potential next year, as I've said he will shoot up my rankings, probably around the borderline of top 10 depending on how others play
(Mcdavid, Drai, Mack, Matthews, Hughes, Point, Barkov, Pettersson) will probably be locked into top 10 slots, with any of Larkin, Suzuki, Eichel, Aho, Miller, Crosby, Stutzle, Hischier, Larkin, Hintz, Bedard, Thomas, etc probably in a range heavily dependent on next years performance.