I just watched the video and don’t think there is any difference at a practical level. What he calls ‘VO2 power’ I interpret as the power when the body is in a physiological state of VO2max. And his protocol for improving power at VO2max is pretty much the same as ‘traditional VO2max’ intervals: Some number of 3-5min intervals as hard as can be sustained across the entire set. It almost seems like a distinction without a difference to me. I’m guessing Phil doesn’t have an exercise physiology background (to be fair I don’t either.)
To nitpick, he says VO2max isn’t trainable. I don’t think the research supports that. There is a genetic component but I thought there was research showing it can be increased with training (even basic endurance training) and also losing weight can improve VO2max since it is normalized by body mass.