If I read the web page, they don't actually use that as a solution to shortening a red - IMHO that has a very high safety bar compared to the more common uses.

If I read the web page, they don't actually use that as a solution to shortening a red - IMHO that has a very high safety bar compared to the more common uses. But I'd be happy to hear this is something that Just Works in the Real World with a reasonable false positive and false negative rate.