I think that's wrong.
There are marine grade paints that contain nasty chemicals to help keep animals from growing on them, and you shouldn't use those in your house, but I think marine grade poly just has UV inhibitors in it to keep it from breaking down in the sunlight. I think it's overkill for use indoors, but perfectly safe once dry.
(This isn't a cutting board is it? If it was a cutting board, I'd do more research to be certain it was safe. But anything that you might touch with your skin would be fine.)
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