I think he's talking about a gold buying a B three days before flight trumping a Plat on something lower. In that case, fare class trumps status.

As to the OP, I agree with those who say this is not necessary and will lead to all kinds of issues. Over the weekend I flew in coach on a B fare that I booked the day before the flight. F was full, with many upgrades and not many on the waitlist, so I assume that at least some of those in F were plats on lower fares, golds and perhaps even silvers. Seeing that would add no value for me, and might cause people who are less familiar with the system to demand that gate agents downgrade people who were previously upgraded via EUA. The transparency there would just not be worth it.