Ttdfjt

I just upgraded my site from Magento 2.1 to 2.3 and while most of my site still works, I have a particular code which has partially failed to work. The code is supposed to get the "details" attribute and display it on my product page, but somehow I am unable to get the data anymore. The alt image still works, so I have no idea what's up. Help is much appreciated!

<?php
/**
 * Copyright © 2013-2017 Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile

/**
 * Product additional attributes template
 *
 * @var $block MagentoCatalogBlockProductViewAttributes
 */
?>
<?php
 $_helper = $this->helper('MagentoCatalogHelperOutput');
 $_product = $block->getProduct()
?>
<table class="moreinfo">
<tr>
<td id="altimage">
<?php
$images = $_product->getMediaGalleryImages();
//$images = $this->getGalleryImages($_product);

//print "n" . ' here2 ' . get_class($images) . ' :: <br/>' . "n"; 
if ($images instanceof MagentoFrameworkDataCollection) 
 $i = 1;
 foreach ($images as $image) 
 $item = $image->getData();
 if ( !isset($item['media_type']) 


?>
</td>
<td id="productdescriptiondt" class="hidden-xs" style="min-width:20em; vertical-align: middle">
<?php if ($_additional = $block->getAdditionalData()): ?>
 <div class="additional-attributes-wrapper table-wrapper">
 <table class="data table additional-attributes" id="product-attribute-specs-table">
 <caption class="table-caption"><?php /* @escapeNotVerified */ echo __('More Information') ?></caption>
 <tbody>
 <?php foreach ($_additional as $_data): ?>
 <tr>
 <th class="col label" scope="row"><?php echo $block->escapeHtml(__($_data['label'])) ?></th>
 <td class="col data" data-th="<?php echo $block->escapeHtml(__($_data['label'])) ?>"><?php /* @escapeNotVerified */ echo $_helper->productAttribute($_product, $_data['value'], $_data['code']) ?></td>
 </tr>
 <?php endforeach; ?>
 </tbody>
 </table>
 </div>
<?php endif;?>
</td>
</tr>
</table>
<div id="productdescriptionmobile" class="visible-xs">
<?php if ($_additional = $block->getAdditionalData()): ?>
 <div class="additional-attributes-wrapper table-wrapper">
 <table class="data table additional-attributes" id="product-attribute-specs-table">
 <caption class="table-caption"><?php /* @escapeNotVerified */ echo __('More Information') ?></caption>
 <tbody>
 <?php foreach ($_additional as $_data): ?>
 <tr>
 <th class="col label" scope="row"><?php echo $block->escapeHtml(__($_data['label'])) ?></th>
 <td class="col data" data-th="<?php echo $block->escapeHtml(__($_data['label'])) ?>"><?php /* @escapeNotVerified */ echo $_helper->productAttribute($_product, $_data['value'], $_data['code']) ?></td>
 </tr>
 <?php endforeach; ?>
 </tbody>
 </table>
 </div>
<?php endif;?>
</div> 
<?php 

// $_product->getAttributeSetId(); // 9 for Clocks

$objectManager = MagentoFrameworkAppObjectManager::getInstance();
$attributeSet = $objectManager->create('MagentoEavApiAttributeSetRepositoryInterface');
$attributeSetRepository = $attributeSet->get($_product->getAttributeSetId());
$attribute_set_name = $attributeSetRepository->getAttributeSetName();

if ( 'Clocks' == $attribute_set_name ) 

 echo $block->getLayout()->createBlock('MagentoCmsBlockBlock')->setBlockId('product_view_clocks')->toHtml();

elseif ( 'Watches' == $attribute_set_name ) 

 echo $block->getLayout()->createBlock('MagentoCmsBlockBlock')->setBlockId('product_view_watches')->toHtml();