Setting aside the probable criminal offence of transmitting orders aimed to confuse without proper identification or authority in an emergency of this nature, just what policy does this cowboy airline teach in simulator?
Assuming that they even DO simulator, surely they train crews to evacuate on the ground in the presence of smoke or fire?
As for a few ingratiate pax whining because the cabin crew yelled at them to get their miserable hides off the aircraft in case it blew up - you are fools to have flown with this mob in the first place, and bigger fools for not understanding why the cabin crew are really there.
So what these airline management morons are really saying to the Captain who took his years of training seriously, and acted on it in a real event is :" How irresponsible of you to risk minor injuries while conducting an approved and entirely appropriate procedure. You have brought unwelcome but deserved publicity to the airline so you are fired".
Perhaps CEOs and bean counters should write all aircrew training programs to reflect commercial priority over safety and try having the FAA approve them.