I’m not sure what you mean. Jetpack contains many modules, so it would probably depend what module output on your website front-end is accessible according to WCAG 2.0. However, as Jetpack is product of Automattic (WordPress.com), I’d say it should be accessible enough. But please note that this question is related to Jetpack plugin and not themes, so I strongly suggest asking Jetpack support for help. They will surely provide you with information you are looking for.