> Even a polite response from HR like, "Sally really enjoyed talking to you but she's unexpectedly tied up in something" can be market-moving information if you find Sally's role on LinkedIn and tie it to recent news about the company.

So a candidate being ghosted can also be market moving because it means the same thing.

Just have HR stall a bit, maybe you're finishing the round of interviews for other candidates or something, it's not that hard.