Well if it's like the old schoolers having high engineering and being able to use it they should, i would think, be able to use any professions/abilities if they had them before nerf. Like having GF'erd items. I may be wrong. I guess he'll just have to test it in game.You -will not- gain benefits from professions past 225. Unless; Blizz recently allowed the whole Master of Antanomy rank 4 or whatev and Lifeblood at rank 4 again.