Which is what any competent twin pilot knows to do and would've done in the first place.
The pilot was young. He was under great stress. He received what was essentially was an instruction from ATC. He needed to descend anyway. I don't condemn him for complying or blindly trusting that the instruction was in his best interests rather than traffic management expediency.
The issue is that the ATSB have a massive blind spot about this and other issues which firstly, denies the ability to understand the truth of the situation and secondly to learn from the experience.
It was a scandalously shabby report.