....has no life....
Why is that the point that you seem to push? Not the smartest thing with someone new to all of this. What can be wrong with a heater and a powerhead to push water around and keep it circulated - at least? Why not? Is the point that it "can" be done? Or is it that you can set up a tank and not do anything if you don't want to? Is it that you can do it all and avoid cost of filters, heaters, or extra water? Why is that the point that should be pushed to a new aquarists...that here you go a great new hobby, and oh by the way, it doesn't require anything from you except to feed and top off water? Why even call it a hobby or something that you like? Its more like a piece of furniture that only gets care when dust settles on it.the point really is a heavy bioload with little maintenance can be successful for years. Which to me is exactly what a new aquariumist should strive for.
Your tanks appear like something similar to a science experiment where you are out to prove to the world what "little" can be done while the majority of the people that do it waste their money. I am fairly confident the link to the pic that the tank looks more like an algae cave is what the true picture of your tanks look like over time and the video is shortly after a setup of one of your tanks, if it really is one of yours and not someone who may have used your methods. Everything in it is just too clean to be anything like you say, or maybe Aunt Pearl doesn't exactly like hideous looking things in her house either, not sure.
Why not a filter? I added 57 fish in one day to a tank that already had about 50 that never saw an ammonia spike or anything - not something you could do without a filter.
Why not a heater? I keep my house at 65 in the Winter. My Angels who like their water around 82 would put me in the poor house trying to keep my entire house the same temp. I don't get forced by a spouse to keep all of my tanks out of my house and kept in a small room that I could singularly control the heat/air condition to the room.
Why not water changes? It is proven that this is what keeps your water safe and healthy - whatever the reason may be. It may not be for you - in an unfiltered, no water change, no dechlor use, tank.
There are a butt-load of reasons to why you should do some of these things, but I only listed one. Only a few why you shouldn't and really only apply to a tank that is very delicate in its balance with low oxygen, non-moving water where it is an issue adding dechlor because it will deplete some oxygen or throw off the balance it took weeks to months to attain because the water is stagnet. If someone doesn't have the money to forego the extra expense and wants to prove to themselves that it "can" be done, your method may be worth a shot. It is a proven method many years ago before filters were around, but if it was the "best" way filters may have never been invented in the first place.
I don't believe however that it is something for new aquarists to attempt.