From later in the article (emphasis author’s)
Earlier in this article I intimated that many of us are already dependent on our fancy development environments—syntax highlighting, auto-completion, code analysis, automatic refactoring. You might be wondering how AI differs from those. The answer is pretty easy: The former are tools with the ultimate goal of helping you to be more efficient and write better code; the latter is a tool with the ultimate goal of completely replacing you.
My first instinct would be that it would equivalent to putting another celestial body the mass of the earth at the distance from the earth is from each portal. Since gravity is a wave, it, in theory, would affect a region beyond what would considered “around” the portals.
So if you put one portal on the ground, and another 100 meters up, it would be similar to there being a second earth 100 meters from the surface of the earth, experienced by the entire earth (once the gravitational wave propagated.) How that would evolve over time is too complex for my basic understanding of physics, but a simulation of it would be a neat experiment.