I think, that the plugin create this meta boxes dynamicly not with the WordPress Core functions, like add_meta_box. This is the reason, that you can not hide this boxes with remove_meta_box. The markup is hard coded in the plugin files and not a part from the WordPress API.
But easily you can hide via javascript. In the back end of WordPress is always active the library jQuery and it is easy to add a little bid source in the footer of the page, there have this meta boxes and hide with the jQuery function remove(). I think is a good idea, that you add the source only on the page, there have this meta boxes. This is possible via hook admin_footer and check for the right current screen, like on edit post is it post as $screen->id.
Alternative is the plugin “Adminimize”, that give it a option and also the possibility to create custom option to hide areas.