The thing is, you have no reason to believe McDavid would put up 130+ in 2014-2017 either in a much more tight checking environment. You seem to be ignoring that while scoring goes up, it favours the top players much more than the depth players and you are not able to exactly quantify the effect.
I’ll try to explain it to you differently. With your adjustment, Crosby’s 2014 season gets adjusted to 116 points, based on 2019 scoring. That is a 11,5% upgrade.
I’ll do the same exercice with the players I mentioned in my previous post with the % upgrade they benefited by playing in a much more wide open scoring environment, in 2019, compared to their production in 2017, which was the last season of the DPE 2.0.
MacKinnon
2019: 99 in 82 (1,21)
2017: 53 in 82 (0,65)
86% upgrade
Kucherov
2019: 128 in 82 (1,56)
2017: 85 in 74 (1,15)
36% upgrade
Draisaitl
2019: 105 in 82 (1,28)
2017: 77 in 82 (0,94)
36% upgrade
Marner
2019: 94 in 82 (1,15)
2017: 61 in 77 (0,79)
46% upgrade
Pastrnak
2019: 81 in 66 (1,23)
2017: 70 in 75 (0,93)
32% upgrade
Panarin
2019: 87 in 79 (1,10)
2017: 74 in 82 (0,90)
22% upgrade
Tkachuk
2019: 77 in 80 (0,96)
2017: 48 in 76 (0,63)
52% upgrade
Matthews
2019: 73 in 68 (1,07)
2017: 69 in 82 (0,84)
27% upgrade
Aho
2019: 83 in 82 (1,01)
2017: 49 in 82 (0,60)
69% upgrade
Gaudreau
2019: 99 in 82 (1,21)
2017: 61 in 72 (0,85)
42% upgrade
Stamkos (Injured in 2017)
2019: 98 in 82 (1,20)
2016: 64 in 77 (0,83)
45% upgrade
Huberdeau (Injured in 2017)
2019: 92 in 82 (1,12)
2016: 59 in 76 (0,78)
44% upgrade
Barkov
2019: 96 in 82 (1,17)
2017: 52 in 61 (0,85)
38% upgrade
Kane
2019: 110 in 81 (1,36)
2017: 89 in 82 (1,09)
25% upgrade
Ovechkin
2019: 89 in 81 (1,10)
2017: 69 in 82 (0,84)
31% upgrade
McDavid
2019: 116 in 78 (1,49)
2017: 100 in 82 (1,22)
22% upgrade
So, I just gave you a 15-16 sample size of some of the best players of the 2020s to show you how much their production befitted of the difference in scoring environment vs how much your adjustments actually give credit to the top players (only a +11% adjusted production for Crosby in 2014, +12% for Kane in 2016, 12% for Malkin in 2012 and 9% for Ovechkin in 2008).
No player benefited of less than a 20% upgrade in production. If you only look at the absolute top players in the game, you see that all of them benefitted of at least a 30% upgrade in production (Kucherov/Draisaitl/MacKinnon). McDavid only had a 22% upgrade, which can be explained by him having a really good 2017 season, compared to his peers.
In conclusion, that evidence clearly showed that top players benefited much more from the higher scoring environment than your adjusted method takes into account. It’s very likely that Crosby, Kane, Ovechkin and Malkin would have benefited from AT THE VERY LEAST a 20% upgrade in production if they were at the top of their game, in 2019, and likely more.