There will be more and more of these grand scheme "ecological" solutions promoted as capitalists frantically try to profit off of planetary collapse. They will always have flashy, idiotic names like "The Line," and they will always be premised upon indigenous displacement and death.
People have known how to live sustainably in the desert for millenia. It hasn't been by building 170km long hi-tech mega-city abominations. None of this comports with a civilization that is earnestly trying to survive on this planet. It's all more extraction, more hoarding, and more death for the undesirables and the dissenters.
From BBC:
Neom: Saudi forces 'told to kill' to clear land for eco-city