Jack wtf are you talking about. The rate of decent is hardly the problem here.
41000 to 0 is 2300 feet per minute. You do an idle decent using economy speeds and you'll achieve this with NO problem......
The report (and JBauer) for some reason suggests that descending with power is a normal efficient way to descend, when clearly every airline in the world would love it to be idle all the way from top of decent until increasing slighting once in full landing configuration. Its called energy management and continuous decent approaches.....
Lets get back to topic.