I think the Barrow Wight would have seen him. Since Tom Bombadil is a foreign entity to Middle Earth, then I think that no matters what realm one inhabits in that piece of land they can be seen. I remember there was a letter where Tolkien talked about the overlapping planes of existence. I think someone posted part of the letter in some thread.
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Medicine for the soul. ~Inscription over the door of the Library at Thebes
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