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I dont understand - so what you're really saying is 'aerobic denitrification doesnt occur to a significant degree'? It wasnt clear (that was the only reason I could think of that the 'hobbyist couldnt test for it).I'll answer both your questions here...
First is that aerobic denitrification is definitely happening but to be sure not in a way a hobbyist can test for.
Second the science that is out there can explain almost everything that happens anecdotally in your tank when looking at the big picture. This thread is talking about the nitrogen cycle. A well established scientific fact. Add nitrates and things improve, well you know the tank was nitrogen starved.
However as we move forward articles like this suggest to me that ammonia is a better way forward
Unravelling the different causes of nitrate and ammonium effects on coral bleaching - Scientific Reports
Mass coral bleaching represents one of the greatest threats to coral reefs and has mainly been attributed to seawater warming. However, reduced water quality can also interact with warming to increase coral bleaching, but this interaction depends on nutrient ratios and forms. In particular...www.nature.com
Now this is in relation to thermal tolerance but I will argue that it does give us insight into stress tolerance in relation to nitrogen forms.
Second - I agree - there are various articles that suggest certain things - but - one point I tried to make - is that even successful tanks vary considerably - on their bacterial content - and diversity - so maybe a lab study on metabolism is not as applicable as you think it might be?