Hello,
What version and license of phpdocx are you using?
Please note that the second parameter of embedHTML doesn't include the same options as addText. When transforming HTML, the widowControl option (default as true for paragraphs) can be set using HTML styles or a custom paragraph style.
If you need to change styles on-the-fly of existing contents in a DOCX you need to use customizeWordContent. available in Premium licenses.
Regards.