No, these techniques do not address issues in digital publishing for which universal solutions are not yet available. The W3C Digital Publishing Interest Group published a W3C Accessibility Note outlining many of these issues.
As solutions become available, they will be incorporated. If Authors encounter issues that are not covered, they are encouraged to report the issue to the appropriate community for guidance in meeting accessibility standards.
The W3C Web Accessibility Interest Group has a public mailing list where issues meeting WCAG 2.0 and WAI-ARIA 1.1 requirements may be raised.
Where do I get help with EPUB accessibility related issues?