This has been done a lot more comprehensively by people who actually know what they are doing. The numbers are well documented (though of course they change slightly year to year) The SHL is a tougher League than the AHL it's been looked at many times by many different people, there should be nothing new here
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No - what I am talking about has not been done. Yes - looking at the very few select players who have gone straight from the SHL to the NHL has been looked at many times and the numbers are a decent starting point, still in its infancy, minimally useful and astronomically flawed. As Tulloch (a supporter of these conversion factors) has pointed out Allsvenskan's translation factor came out as 0.80 - way higher than the SHL although it is clearly a much, much inferior league and Jr A Liiga's translation factor came out higher than Liiga's which is equally absurd. And that is why those leagues were not included in the tweet in your post, but anyone who sees them would understand how completely flawed those numbers are.
The reason that happens is among the reasons I have pointed it out for it being extremely flawed. The number of Allsvenskan players who jump straight to the NHL is both extremely small and only the very best of the best, whereas many more players from the SHL jump straight to the NHL, so that includes both the best and a bunch of other pretty strong players. This skews the numbers way up for Allsvenskan. There are ways around this - Tulloch applied the Wilson method - for instance tracking players who jump from Allsvenskan to the SHL as well as those who jump to the NHL - but only did so for European teams - and your post doesn't show that application.
This is the exact same problem with the evaluation comparing the AHL to a league like the SHL. Far more players go from the AHL to the NHL, than from the SHL to the AHL. While players going from the SHL to the NHL are both the best and a bunch of other pretty strong players going generally into top 6 and top 4 roles - otherwise they would go to the AHL, players going from the AHL to the NHL include both the best and a bunch of other pretty strong players and others who are not as strong heading into fourth line and 3rd pairing roles. This skews the SHL upwards in the same way Allsvenskan was skewed upwards, and the only way to correct it would be apply the Wilson method and include players who go from the SHL to the AHL. What the end result would be I have no idea, and I don't really care. As I already showed, I looked at 20 players who have gone from the SHL to the AHL over the last two seasons and they averaged a 14% drop in ppg.
Until players who come to the AHL from both the CHL and European teams is completed - the numbers displayed by you are pretty much worthless for the AHL as far as I am concerned. Even then I would want the numbers taken for a 3 year period instead of 2 to give more accurate numbers.
If you don't understand how completely flawed those numbers are then you can't be helped.