So TAIC believes that the pilots should have ignored the manufacturer's advice about the technical performance of their system?
What about if they ignored advice and that caused an incident?
This looks like a classic case of being wise after the event. Maybe, if they had the fuel, they would have been been better off holding and contacting TAIC to ascertain the correct course of action from the investigator.
Come to think of it, I might start adding some margin fuel for accident/incident investigation in the future.