In that quote, Bayohne is referring to unlocking jobs. It's still unclear whether we'll be able to use the jobs with other classes.
Actually you're just in denial. Bayhone's post clearly states that its on job per class and he even gave an example of Gladiator unlocking Paladin (i.e., Gladiator specializes as Paladin) and he even went on to say there is nothing planned with regards to job specialization on different classes, the typical response you would expect from SE. Job are only specializations, so it will take Gladiator and make it a much better tank and call it Paladin (it will do this by tweaking its stats most likely and giving it access to job specific abilities), it will do the same with Marauder and make it a much better DD and maybe call it Warrior, etc. They are separating overworld party/solo play from party dungeon play. At first I thought its a good idea now I don't even care.