It says "files with embedded fonts", not "embedded subset", or "embedded in an unembeddable way" or anything more restrictive.
I actually think that you're probably safe using these fonts in ePubs for the time being, though I'd put a copy of the font license inside the ePub (not linked to the spine, and so invisible to anyone except those who extract the files from the ePub).
It might helped if someone actually asked them, however. Maybe they would clarify.
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