So, this assumes our “adversaries” do not have satellites orbiting around the earth too, able to hand off tracking data from one to another as it leaves one ‘s sensor capability and moves into anothers? Why do I think this article and writer are idiots?
You think they’re idiots because they’re idiots.
If the normal orbit intersected the atmosphere deeply enough to allow maneuvering, it would decay and return to earth after not many orbits.
If it doesn’t intersect the atmosphere, the only way to use the atmosphere for maneuvering is to decelerate to drop into the atmosphere, turn, and then re-accelerate to push the perigee above the atmosphere. It would take less fuel to just light the engines and directly perform the orbital change desired on rocket thrust.