It has been 5 since this comment. Did you publish your book yet?He ain't talking about the Earth. He's talking about the plane of existence that the Earth (and this universe) resides in, which is why typically spacial rips (like the one that banished MC) are cut vertically and open to a plane directly above or below the current plane.
It's kinda similar to my explanation of sub-dimensions in the book I'm writing. (gimme like 10 years and I'll publish it lol)