No, its not true. Well, it works, but there are better ways. The reason it does not work is the person making the stuff gets bupkiss for making things, and then has to transfer things to you 6 at time, and it will take 1000's of decons to get to 50. You get more exp from deconning mob loot anyway, or at least close to the same exp
In a nutshell, go grind mobs for loot and decon the gear. Best overall way to level crafting. If you want details, there are loads of threads that explain it, but they all sum up to: Decon Mob Loot