Sorry I missed this thread. Thanks for bumping it.
Who am I to argue with Utley? Still, I don't think it's important for both forearms to be "level". In fact, Kevin Weeks, who is basically an Utley disciple, wanted me to relax my right forearm (dominant side), and keep it "below" the left. This helps me take the putter back on an inside arc, while minimizing my right hand dominant tendency to take it back outside and pull back to the ball. This lets me set up square to the target and aim straight at it, instead of aiming right of the hole.
Just my experience,
John