No, it's a port of the Terra map script, not Earth.
Since you don't seem to know, in Civ 4 and Civ 5, the Terra map script isn't producing Earth, it's producing an Earth-like configuration, namely a large main continent (Eurasia), two smaller ones, often with a thin connection (Americas) and another small continent and/or island group (Oceania).
For example, that's what the Civ4 Terra produced:
Spoiler:
Looking at the mini-map... it looks like it's working.
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