The first sentence of the report recommendation :
L’enquête a mis en évidence des dérives répétitives par rapport aux procédures opérationnelles écrites au sein de la direction des essais pour la réalisation des essais au sol
Basically saying that repeatedly test technicians were not following the written procedures , but this must have been known by their superiors as everything was taped.Commercial pressure is mentioned in the report.
Anyway lessons have been learned as those procedures have since been re-written , ( max 2 engines at a time, chocks in place.etc.. ) according the report, and now even the ground controllers have to verify on the R/T that chocks are in place before giving authorization to start an engine test run .