Stop Push Syndication Plugin from Auto Publishing

tenup_dont_publish_pulled_post.php

<?php

// Remove `publish_pulled_post` hook from `syn_pre_pull_posts` filter during cron
add_filter( 'syn_pre_pull_posts', 'tenup_dont_publish_pulled_post' ), 100 );
function tenup_dont_publish_pulled_post( $posts ) {

	// Remove auto publish action
	if ( class_exists( 'Syndication_WP_XML_Client' ) )
		remove_action( 'syn_post_pull_new_post', array( 'Syndication_WP_XML_Client' , 'publish_pulled_post' ), 10, 5 );

}