It is not entirely "cored." But it is generally cored below the waterline (not including the keel). It appears to me that after the initial layup in the hull plug, certain areas were stiffened with sections of balsa, that balsa then got more glass laid over it from the inside. It also appears that the areas around thru-hulls that are factory installed are solid glass. I would caution not to install a thru hull through the balsa core unless you're very careful to seal the balsa completely. Saw someone doing it on Youtube and wasn't wild about what they did.
The balsa was laid in panels and where they're at, from the interior view, is obvious. You can see it in your starboard cockpit locker. Drop down in with a flashlight and look around. The balsa cored areas are proud of the areas where there is no balsa. That said, I can see where water intrusion due to a whack or something might be problematic in a cored section.
If you're concerned, checking with a moisture meter doesn't hurt, understanding that you are dealing with relative readings. Start with a baseline for "really dry" above the waterline in a non-cored area. You WILL show an increase even in solid glass below the waterline, but if there are any issues with the balsa the indicator should show you. This takes practice, and I haven't done it in years.
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