Keep in mind that “having a plan”, doesn’t say when that plan is to be executed.
If you asked me, every object launched into orbit, should have a safe de-orbit plan beforehand. Chances are, as more private entities get onboard launching space stations, there might be regulations put in place to require a de-orbit plan for the launch to get approved.
Getting a de-orbit plan for the ISS now, might be just a preemptive plan for when those regulations get enacted.