Re: Repairing (not restoring) the 14' Superglas
At this point, you're probably better off waiting for temps to get high enough for a few days to ensure that anything frozen has thawed. You may see water leaking out of that area and answer your own question.
That said, it looks like every other piece of wood in that hull will end up being replaced, so you may want to wager whether that small area is likely to have escaped the same fate as the rest of the craft. There's plenty of work to do aft of that area though, so no rush on deciding that specific item either.
When you remove the forward end of the old stringer, you may get a better view of what lies ahead/above it.