Why does Bitrix make data secure?

Question

1C-Bitrix

I turn off the activity of goods from the 1C database through processing in Bitrix init.php
Sometimes, after the import from the database is completed, Bitrix makes the php code safe and, so to speak, cuts out part of the code altogether.

here is the whole init.php code, tell me
what could be?
Put an exception in the proactive filter /bitrix/php_interface/*

<?
AddEventHandler('catalog', 'OnSuccessCatalogImport1C', 'DeleteCatalogItems');

function DeleteCatalogItems()
{
  $IBLOCK_ID = 52;
  if(CModule::IncludeModule("catalog") && CModule::IncludeModule("iblock")){

  $arSelect = Array("ID", "IBLOCK_ID", "NAME", "AKTIVNOST_NA_SAYTE");
  $arFilter = Array("IBLOCK_ID"=>IntVal($IBLOCK_ID), "ACTIVE"=>"Y", "!AKTIVNOST_NA_SAYTE"=>false);
  $res = CIBlockElement::GetList(Array(), $arFilter, false, false, $arSelect);


    while($ob = $res->GetNextElement()){
    $arProps = $ob->GetProperties();
      if ($arProps['AKTIVNOST_NA_SAYTE']['VALUE'] <> 'Да') {
      $arFields = $ob->GetFields();
        if(CIBlock::GetPermission($IBLOCK_ID)>='W')
        {
          $obEl = new CIBlockElement();
          $boolResult = $obEl->Update($arFields['ID'],array('ACTIVE' => 'N'));
        }
      }	
    }
  }
}