Try this. I cleaned up your arg array and placed everything in a function. Also, why are you using the getInstance method when your efpd_admin_notice is public? See the code below for accessing this method properly.
function plugin_update(){
$plugin_update = Efpdd::efpd_admin_notice(array(
'type' => 'update',
'message' => 'The plugin has just been updated.',
'button' => 'Click for details'
);
echo $plugin_update;
);
add_action('admin_notices', 'plugin_update');
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