I would agree with his general characterization of the Rangers farm system, but I would have Kravstov, Lias, and Ragnarsson higher than he does.
I think he underestimates Kravstov's playmaking ability. Last year Kravstov actually had the same amount of assists as goals (16) and of the 10 assists of his I've watched, 7 of them were primary, including some really brilliant passes, and the 3 secondary assists were all plays where his pass directly created the scoring chance. Additionally, I find the significance of Kravstov getting knocked off the puck gets way overblown. Firstly, how many of the prospects Pronman will rank above Kravstov, like Wahlstrom or Hughes for example, wouldn't have had trouble with the physicality of a professional league if they had played in a professional league instead of a junior / college league? Secondly, Kravstov is 6'2" and is a fantastic skater. How many guys like that have trouble protecting the puck once they are physically developed? Finally, Kravstov's production (which puts him in line with guys like Kuznetsov, Panarin, etc) came despite the fact that he gets knocked off the puck. Why does a guy who is as skilled as he is need to be a bulwark on the puck? There are plenty of elite NHL scorers who produce despite limited physicality.
I agree with his characterization of Lias as a guy with skilled hands and great hockey sense who is an average skater but has off-the-charts work ethic and is aggressive going to the dirty areas. The question with Lias is, when it comes to his offensive upside, how much can his work ethic and willingness to go the dirty areas offset his average skating ability? I don't think there's an obvious answer, but I tend to lean on his production as a cue (and I think his production is especially significant because it has been consistent in a variety of situations [HV 71, Frolunda, WJC, Wolfpack] which greatly reduces the odds that his production is a function of the situation he was in, as opposed to his intrinsic ability). So the fact that he scored at the same rate in his draft + 1 season that guys like JT Miller, Mika Zibanejad, and Anisimov (who all turned into 40-50+ point players) scored at in their draft + 2 seasons, biases me to think he projects as a top-6 player instead of bottom-6 player where Pronman has him.
I also disagree with the argument that Ragnarsson doesn't have the ability to make plays at higher levels. His scoring rate was comparable to OEL, Mattias Ekholm, and Rasmus Andersson, who are all excellent offensively in the NHL or AHL. So it seems like a big jump to me to conclude that Ragnarsson won't be able to make NHL plays at even a 3rd pairing level.
In general, I think Pronman's style, which weighs observed skill / flashy plays heavily, tends to penalize prospects in pro leagues relative to prospects in junior leagues and that bias seems pronounced to me in his evaluations of Kravstov, Lias, and Ragnarsson.
Other than that, his rankings make sense to me, and my difference in opinion would only put the Rangers at 6-7 instead of 11th, so I don't think it's a particularly big deal. Big picture, while I don't agree with every decision Gorton has made, his willingness to rebuild voluntarily and get value for established players instead of trying to make an unlikely playoff run has greatly improved the Rangers future prospects and I'm hopeful that, with some luck, in another year or two we can have the foundation for another run at the cup.