Because paradox and conceptual opposition have always been signatures of paradigm changes, and de-growth is only a reform while paradigm changes transform the key realities of entire systems/bodies of knowledge and areas of human endeavor.
This doesn’t mean that we need to continue to worship and pursue unlimited growth, but there are ways to mitigate consumption and resource usage while at the same time utilizing the new monetary paradigm of Gifting in intelligent and strategic ways that will enable us to change the deepest problem facing the ecology, and that is the paradigm of geo-production and resource discovery ONLY to cosmic-production and resource discovery.