Nothing has changed recently. They recommend divers ascend at a rate consistent with the instruction of the computer they are using and doing a 3-minute safety stop at about 15 feet. If people are using tables, PADI says they should not exceed 60 FPM, which was the standard ascent rate when the tables were created. They emphasize slow, though, so slower is better. DAN's publications are pretty much the same, emphasizing slow ascents. They do not identify an ascent rate that is too slow, and that is because there is no literature suggesting that an NDL dive can be too slow, unless the diver goes slow enough to violate NDLs.BTW, what are the PADI or DAN recommended ascent profiles now?
In theory, a diver should be able to ascend at a normal rate from any depth at any point in an NDL dive and go directly to the surface without harm. The safety stop provides an extra level of protection.