Hi Japes, welcome to MobileRead.
I can't comment on the Sony Reader behaviour, I leave that to others.
I can tell you what an embedded font is as far as this plugin is concerned. An embedded font is one or more font files (.ttf or .otf) embedded inside the epub. In addition to the physical font files, there will usually be references to these fonts from the .opf manifest file inside the ePub, indicating they are a part of the ePub contents. Finally, there will be css declarations of @font-face, pointing to the embedded font files.
This plugin can remove the physical font files and any links to them from the opf manifest. What it does not do is touch the css file in any way. So as Kovid said in a few posts earlier, if the ereader processing the stylesheet does not find the font at the location pointed to in the @font-face declaration, then it is ignored.
So to me what you are doing with pointing to a font on your Sony is not what is classed as an embedded font, because the font is not contained inside the ePub and instead you are hard-coding to a font on your reader.
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