User blog comment:MakeShift/The Crisis and its impact on the Arrowverse Wiki/@comment-34482890-20200123063154/@comment-25054842-20200123152054

Agree. I think the CW put that in the episode just in case the Green Lantern HBO show is picked up and WB allow it to take place in the Arrowverse's multiverse. If the show will be made but the CW can't include that in the Arrowverse, than that earth is just a generic Green Lantern earth.