English skills, people. He said that if your profession can use a weapon, and you're a high enough level for that particular weapon you can use it. It doesn't mean that you can only start using some weapons at a certain level, but individual pieces of gear have individual level requirements (just like raid gear can only be wielded by max level characters). There is no 'training' restriction, if you get a lvl 10 sword, you need to be lvl 10 to use it.
It's not rocket science.