That is true. That said comments are legal in xml but do not provide functionality. Pieces of the opf should not be commented out to hide them for later given the opf must be completely parseable inside Sigil at all times. Simply copy that text to the clipboard and access it via the cliphistory when and if desired. This is the way Sigil has worked since Tidy was removed. The opf is kept as it was designed to be, as machine readable.
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