Aren't good PR people supposed to "sell" their story directly to a "journalist", without an intermediate publicly available press release? Will this tool find those? Also, there's a certain irony in that this story itself almost certainly is "planted" PR.
That would require that the "journalist" pay attention and not just directly look through their pile of releases for a "story". News departments are lazy and don't want to pay for real news, they want it spoon-fed.