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As long as they are normal dashes, that line is a valid xml comment. Nothing should complain about it. If it was generated by Mend in Sigil it was created with normal dashes and is correct.
If however you run a smarten plugin and it does not understand xml/xhtml/html comments, it will change the normal dashes to endashes or emdashes. That would then make that line illegal.
epubcheck will not complain about valid xml,xhtml,html comments. It should complain if changed to endashes or emdashes.
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