I can't access that link, it says the content is un-available.
So if you could explain what deals with the waste in that tank, then great. Personally I'm a little bit wary of such claims, the tank would have to be heavily understocked and you would need something to deal with the waste in there. Otherwise you would have a still water situation, which can lead to stagnant water if left alone long enough. With no aeration there can't be very much gas exchange going on? I've always thought water movement at the surface was the best way to go, so I'm surprised one's been set up as still water. I've only ever done filterless/still water with snails that I know can live with it.
Although 90 gallons is a pretty big tank, so if that were under stocked, then yes it would take a long time for pollutants to build, but I personally wouldn't want to try it on a small tank.
I accidentally left my filter off on my goldfish's tank for a week, it's 90 litres/3 foot in length and she's the only inhabitant in there. The filter was fine, the water was fine, I was lucky, but I wouldn't do it again and I wouldn't attempt to go filter-less, but that's my personal preference
If you could provide more information about how this actually works, I'd love to read it. I don't know a massive amount about salt water tanks, but I personally would not attempt this on a goldfish tank, they are too messy to be left alone
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