This was already answered on the same page as the post that you quoted. Do you have any reason to distrust the sim's trinket priority besides someone else's unsubstantiated question from 3 months ago? If so, bring it to the table and discuss it with numbers. But don't ask someone else to explain the sim result for you, particularly when you can't be bothered to read even the rest of the page where the original question was discussed.
Originally Posted by Gaws
Yes, Heroic Will of Unbinding & Shard of Woe are both BiS for Arcane. The nerf applied to healers, 205 mana for Arcane was already nerfed in T11, afaik.
Is'nt Cunning of the Cruel before Shard of Woe? Rawr show that it is the BIS with Heroic Will of Unbinding...