Not true. He played in the OJHL which is a part of the CJHL, Canada's Junior A league. The prime difference between Junior A and the CHL is that players can maintain college eligibility in Junior A, where they can't in the CHL. The CHL has better competition, sure, but there's no reason to think that just because a guy played CJHL hockey, he sucks.
A few players from the CJHL include Kyle Turris, Scott Gomez, Tyler Bozak, Travis Zajac, Beau Bennett, Mike Comrie and Dany Heatley.
Hyman may not end up being a NHL player, but it will have nothing to do with playing in Junior A. Several players heading to colleges went to the CJHL instead of the USHL last year (the Penticton team, in particular, was stacked).
If you watched Hyman at Michigan last year, he looked good in his limited ice time. I liked his speed, and his defensive play was very solid. He wasn't asked to generate a lot of offense, but he has solid hockey sense, and good hands went he went up ice. I think he should show some nice improvement this season for the Wolverines, and get more ice time as he develops.