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No. "Tag soup" html is not xhtml. My guess is the w3c validator is only validating html (what the writer called tag soup) and is not an xhtml validator.
Again, I would not trust the w3c validator to validate real xhtml. If it passes epubcheck and is well-formed xhtml/xml then I think you are fine. A good way to check your xhtml is to load your epub into Sigil or Calibre's editor and look if Preview detects any not well-formed errors.
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