The word “terraforming” sounded wrong in this episode as it means to change something to sustain human life. But here it was supporting an alien lifeform, so it was not completely right. Probably the writers used it as a meaning as the changing of the planet.
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The database of the Gadmeer could have been used for the search of Icarus type planets in Universe as they have checked thousands of planets....
I also could have used them in the Revisions episode, but obviously not every toxic athmosphere are the same.