You’d have to get two offers, accept one of them, start getting onboarded by the company you accepted, learn about the OS policy, without the second offer having expired. Maybe your experiences are different but based on mine that’s completely unrealistic.
Or maybe the second offer came in after having accepted the first one. That seems a lot more realistic, though extremely dependent on timing. But the most realistic scenario is, OP already had a job. But honestly if OP wasn’t just karma farming I’d expect them to have included the full story. So I’m pretty inclined to think this whole thing is bullshit.