Yes I did see that video. Over on the 986Forum, the question came up of the data points versus time. Here's the data arranged that way.
It definitely seems like bank 2 is not advancing as much as bank 1. I guess the variocam system advances the intake cam by 13 cam degrees (or 26 crank degrees. I'm guessing the system measures everything in crank degrees). So the bank 1 intake cam appears to have lost about 1 degrees of advance, while bank 2 seems to have lost about 2 degrees of advance. So maybe bank 2 is the real problem(?). Or is it that both sides are retarded (i.e. 1/4-1/2 degree of wear on the tensioner ramps for the long chains, or the chains themselves), in addition to 1-2 degrees of wear on the variocam ramps?
Either way, I'm going to replace the variocam ramps on both sides while I'm under the car.