We need to genetically engineer trees and the like to produce houses. We should be living with life rather than a cancer against it.
We currently have a destructive parasitic relationship with our ecosystem in which we consume resources without replenishing them, whereas the goal GP described is to pursue a more symbiotic parasitic relationship in which we give back resources that allow for the continuation of the ecosystem, even if in an altered form.
Depending on your interpretation of 'symbiotic' the proposal by the GP may better be described as 'disadvantageous' as by engineering our environment we put it in a relatively inferior state compared to its' natural one.
This may properly be called commensalism, if the benefitting species avoids harming its host.