However I would like to think that if they were made aware of the true situation then they would have chosen to evacuate. FWIW the Captain is the person who is responsible for initiating an evacuation not the Fire Chief.
Having been made aware of the
true situation they decided NOT to evacuate, the Fire Chief passes back up to date information from the scene of the fire
and may add a recommendation. No one is arguing as to who makes the decision. Those that say they would have evacuated regardless of the information available are the ones who will deliver you out of the frying pan and literally, into the fire.
Finally, there is no comparison between the Manchester incident and the Singapore incident.