How to display comments and comments form on custom node pages
Add your theme hook suggestion in Node preprocess hook instead of Page Preprocess

if (isset($variables['node']-&gt;type) &amp;&amp; !empty($variables['node']-&gt;type)) {   $variables['theme_hook_suggestions'][] = 'page__node__' . $variables['node']-&gt;type; }


Now $content variable should be available for you.. Please remember Clear Cache