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Sigil says it really cannot read the file. So I changed the file-extension and had a look inside.
This epub does have an OEBPS/Fonts/font00318.otf, and this entry is mentioned in its <manifest>: <item id="item73" media-type="application/x-font-opentype" href="Fonts/font00318.otf"/>
Not sure whether this makes any difference.
Strange thing is - well, to me - that neither ADE 4.5.12 nor Thorium Reader V3.3.0 seem to have any problem reading the epub.
Anyway, I'll keep digging.
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