 
        -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'liga';$hldata_res= \Bitrix\Highloadblock\HighloadBlockTable::getList(
  array(
    'filter'=> array(
      '=NAME'=> 'PositionUser'
    )
  )
);
$hl_data= $hldata_res->fetch();
$hlentity= Bitrix\Highloadblock\HighloadBlockTable::compileEntity( $hl_data );
$hl_class= $hlentity->getDataClass();
echo $hl_class; 
получаю <b>\PositionUserTable</b>use Bitrix\Highloadblock as HL;
use Bitrix\Main\Entity;
CModule::IncludeModule('iblock');
CModule::IncludeModule('highloadblock');
$hlblock = HL\HighloadBlockTable::getById(4)->fetch(); // id highload блока
$entity = HL\HighloadBlockTable::compileEntity($hlblock);
$entityClass = $entity->getDataClass();
$rsUser = CUser::GetByID($USER->GetID());
$arUser = $rsUser->Fetch();
$doppolya = $arUser['UF_POSITION_USER'];
   $res = $entityClass::getList(array(
       'select' => array('*')
   ));
while($el = $res->fetch()){
	  if ($el["ID"] == $doppolya)
			echo $el['UF_POSITION_USER'];
	}