Hi Jerome,
It seems while migrating your code from Adobe Tag Manager to your s_code file, this line of code was also copied. This is native to Adobe Tag Manager and should not be used here.
Please refer to the below article which details the steps for migrating Adobe Tag Manager 2.0 to DTM and you will see in the instruction that this line should have been removed:
https://marketing.adobe.com/resources/help/en_US/dtm/atm2_migrate_map.html
~Kaushal