Ya - commercial licencing is very complex, confusing and complicated. The key words there are: "limited entry vessel based licence eligibility retaining Schedule II Species privileges".
So, if you owned a commercial vessel-based licence prior to 2013 that had tuna in it (C & FC) or any other licence with tuna on it (ZN or L; rockfish or groundfish but not trawl and dive) - you can apply (on an annual basis) to get it added back in - IF there is a spare Schedule II licence to add to your existing valid commercial licence this year and your vessel meets length restrictions for that tuna licence.