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Specifically the article says that our friend probably waded into the water to eat fish. Since I've observed first hand animals that wade into the water for a variety of reasons but don't hunt fish in any way.... what credence should I lend to this assertion?

There are a couple of points in there, actually. JMO, but the assertion that the animal waded into the water seems quite solid. That it did so in order to catch fish is rather more speculative, as you point out. It's a reasonable hypothesis to explain the behavior of a carnivore entering the water, but it's not at all a certainty.

However, if you and I were to sit down and make a long list of carnivores that go into water but don't hunt fish... well.... we could make a very very long list, don't you think? Even a list that includes birds. I'm not sure it's a good hypothesis.

And I wonder how it's determined that they were swiming "out to sea". Is that 10 meters, 100 yards, 2 miles.... Or is it like my border collie who swims around when it's real hot and then gets out and lays under a shade tree to cool off.