Anyone that makes a statement like that would worry me to dive with, while it may be true monitoring is what IMHO a competent diver does nothing left to chance. But it is a good question.With your current SAC rate and staying within recreational depths can you have NDL become the limiting factor on your dive if you surface with 500psi in an al80 cylinder? Not a repetitive dive.
I can normally, including plenty of profiles run on the U.S. Navy tables.
I've heard it at least a dozen times that with 68cf of gas, there's no need to monitor NDL for the average diver if there are doing only one dive on a weekend.