My overall two cents on this topic.
One, I don't necessarily disagree with with elements of this idea. Certainly local responsible management of resources is going to be better than factory farming or strip mining. There are a lot of smaller scale practices carried out by native peoples that are far better for the environment than those carried out by colonists, or at least neutral.
Secondly, If Chosun's thesis is correct, it's not going to overall a long term solution. As others have commented, Human population growth has put us at a point that many indigenous practices are not going to be viable to maintain civilization. There are solutions to be found there in keeping certain environments from worsening, but we are not going to be able to employ those methods globally to the scale needed. At best, perhaps after long term scaling back of human population growth, we will be able to incorporate some of these practices at a wider scales.
Third, I think this really does fall prey to shifting baselines and the "noble savage" trope. We look at traditional practices that were present at the arrival of Europeans and see various peoples seemingly living in harmony with nature. However in almost all cases the "harmony" we are seeing was engineered by intentional and unintentional modifications of the environment which occurred hundreds if not thousands of years before the arrival of Europeans. Take a hard look at megafaunal extinctions: With the exception of SE Asia and Africa, which had long periods of time where humans essentially evolved alongside the ecosystems, we get an almost wholesale lost of biodiversity shortly after human arrival, and the loss of many of those animals completely changed the ecosystems present. Losing the mammoths of North America meant that arctic grassland in general disappeared, as well as spruce parkland: Two unique habitats no longer present in North America. Similarly, it's believed that overuse of fire in Australia completely changed the environment and spurred intense aridification for instance which almost certainly impacted the native megafauna on top of human hunting. The introduction of the Dingo also was a bad blow, wiping out many native predators from the mainland (Thylacines and "Tasmanian" Devils were once widely distributed on the continent).
Effectively, judging the stewardship of the environment on European arrival is not taking in the full historical context. It's like judging the present environment of say, Great Britain, and making the leap that everything is fine and dandy, and not realizing how much deforestation and introductions occurred, or how many predators were extirpated. Indigenous communities were good stewards of their "environments", but lets not pretend those environments weren't already heavily altered or that they are in anyway "pristine".