IANAL, but the headline and article sound very different from everything else I've read about this. Prior art isn't going away. Even in "first to file", that is

IANAL, but the headline and article sound very different from everything else I've read about this. Prior art isn't going away. Even in "first to file", that is only if there isn't prior art. IOW if there is no prior art, the first to file wins. That makes sense because otherwise, proving who was actually first is terribly hard. But, if there is prior art, no one can patent it anymore (in theory).