slowjet, that was one of the most uninformed posts I have seen in a long time.
Based on the tape, it sounds like these guys removed their masks on the approach, so they must have identified and dealt with the source of smoke. At that point, you are transitioning from emergency to precautionary landing. Therefore priorities such as fuel dumping, cabin ready, etc get reassessed. Listening to the audio, I'm hearing some very professional pilots and ATC dealing calmly with a difficult and dynamic situation. Well done.