Update your custom fonts article to include local fonts example
Update Custom Fonts:
http://help.slides.com/knowledgebase/articles/1077976-custom-fonts-pro to include how to embed local fonts (https://google-webfonts-helper.herokuapp.com/fonts)
Currently, the last paragraph states "Offline
Note that custom fonts are always loaded from a third party server and will not work when presenting offline from a ZIP or Dropbox export. They will work offline when exporting to PDF, though."
With the link to google-webfonts-helper users can pull only the fonts they need to run offline.
:) It would also help to provide feedback if there was a link or ability to comment on your articles directly from the individual article page.