Disable existing products that missing in the new products feed

urapidflow.php
<?php
// initialize Magento environment
use Magento\Framework\ObjectManagerInterface;
 
try {
//    if you move this file, adjust bootstrap.php path
    require __DIR__ . '../../../../../app/bootstrap.php';
} catch (\Exception $e) {
    echo <<<HTML
{$e->getMessage()}
</div>
HTML;
    exit(1);
}
 
$params = $_SERVER;
$params[\Magento\Store\Model\StoreManager::PARAM_RUN_CODE] = 'admin'; // change this to appropriate store if needed.
$params[\Magento\Store\Model\Store::CUSTOM_ENTRY_POINT_PARAM] = true;
$bootstrap = \Magento\Framework\App\Bootstrap::create(BP, $params); // bootstrap
 
/** @var \Magento\Framework\App\Http $app */
$app = $bootstrap->createApplication('Magento\Framework\App\Http');
 
// configure environment
$om = $bootstrap->getObjectManager();
$areaList = $om->get('Magento\Framework\App\AreaList');
$areaCode = $areaList->getCodeByFrontName('admin');
/** @var \Magento\Framework\App\State $state */
$state = $om->get('Magento\Framework\App\State');
$state->setAreaCode($areaCode);
/** @var \Magento\Framework\ObjectManager\ConfigLoaderInterface $configLoader */
$configLoader = $om->get('Magento\Framework\ObjectManager\ConfigLoaderInterface');
$om->configure($configLoader->load($areaCode));
// end initialize Magento environment
 
// the export file contains SKUs and Status columns
// in file var/urapidflow/export/existing_products.csv
 
/** @var \Unirgy\RapidFlow\Helper\Data $helper */
$helper = $om->get('\Unirgy\RapidFlow\Helper\Data');
$helper->run("Export Existing Products");
 
// collect new skus from the feed
$newSkus = array();
 
// the new products feed
$fs = fopen('var/urapidflow/import/new_feed.csv', 'r');
$columns = fgetcsv($fs); // read column titles
while (($r = fgetcsv($fs))) {
    $row = array_combine($columns, $r);
    $newSkus[$row['sku']] = 1;
}
fclose($fs);
 
// the existing products export
$fs = fopen('var/urapidflow/export/existing_products.csv', 'r');
$columns = fgetcsv($fs); // read column titles
 
// new file to update products statuses
$fd = fopen('var/urapidflow/import/update_status.csv', 'w');
fputcsv($fd, array('sku', 'status'));
 
while (($r = fgetcsv($fs))) {
    $row = array_combine($columns, $r);
 
// if you're using not English as a store language, change the status text
    if (empty($newSkus[$row['sku']]) && $row['status']!='Disabled') {
        fputcsv($fd, array($row['sku'], 0));
// you can also delete missing products (uRapidFlow Pro)
// will require profile "Data Type" = "Product Extra"
//      fputcsv($fd, array('-CP', $r['sku']));
    }
}
fclose($fs);
fclose($fd);
 
// add and update feed products, uses file var/urapidflow/import/new_feed.csv
$helper->run("Import Products");
 
// update missing products status, uses file var/urapidflow/import/update_status.csv
$helper->run("Update Product Status");