I think you are right, the attributes 'fo:color' for the text color and 'style:text-line-through-style' for strike-through text are not found in the ods writer unit.
You can file a bug report, but since nobody is working on this package, you'll have to wait for a while... Or you try to fix it yourself. It should not be too difficult: Using LibreOffice Writer create a document with a few words only, put one word in bold, and another one in some well-defined color. Since odt files are renamed zip files you can open the file contents if you rename the file to .zip and unzip it. You'll get some folders and some xml files. Find "content.xml" and open it in a text editor or, better, in an xml viewer (for better formatting) and find where the text color style is stored. Compare with how bold is stored. (If you have an unzip gui like 7zip you can achieve all this within this GUI after a simple right-click in the explorer) Then open the fpvectorial odt writer unit and find where the text styles are stored. Extend the code such that text color is written analogous to the bold style using the node names found in the odt file.