It sure doesn't seem excellent....
Remember that this is a forum for helping people avoid problems in their tanks. If you don't like being redirected to the answer of the question, there's nothing I can do for you. If you have a point and try to disguise it, don't be surprised if you don't get a reply that matches what you are thinking of. Personally I'd just like to reiterate that all I want is to help the person who asked a question avoid a potential problem that we know about.
Denitrification is accomplished by anaerobic processes, yes, but not fast enough to rid the aquarium of all nitrogen compounds, so you still get the slow release of ammonium and methane from other anaerobic processes.
But in a planted tank those aren't the problem. The creation of the nasty sulfur compounds that you started to bring up earlier also occurs in the anoxic substrate, these ARE poisonous. Rumors? No, not rumors, ask the last person who got to smell rotten eggs when they stirred up a substrate and pulled up wilting crypts with blackened root tips. What a wonderful result of a deep sand bed.
The daily interplay between aerobic and anaerobic processes in a planted tank substrate is absolutely necessary for the rooted plants to obtain their nutrients and detoxify the area around their roots. The problems occur when a substrate goes completely anoxic and is never “switched” allowing the “rumors” to build up.
Aquascape? I'm a crypt farmer.
It's a fine line between fishing and standing on the shore looking like an idiot.
That IS an aquascape, it's titled "The Vacant Lot".