Tried it today in a 333. Activated the approach over an hour before landing: approach page VLS jumped from 127 to 136 and steadily reduced back to 127 for landing. Uncanny: it was as though the aircraft knew how heavy it was and knew that we were getting lighter as the fuel burned down. (As expected, screwed all the predictions though...) As was said earlier, don't read too many nuances into FCOM English, it's a foreign/second language to most of the authors after all.