Mobify is discontinuing support for this particular module - but NOT for Drupal!! The recommended mechanism for deploying Mobify on all new sites (including Drupal sites) is to use the javascript redirection method. The javascript snippet for redirection is provided in the 'Deploy' panel for your site in mobify.me. The snippet is unique to each site.
Why discontinue the Drupal module?
1) It doesn't do much. It detects phones based on UA and sends a 302 redirect. The same can be accomplished in javascript making it one less "moving part" to maintain.