The literal interpretation of this would be a Wingate test every interval. I don’t think that’s something that many people would do - and probably not make for a very good vi2max workout.
The goal with the hard start is to quickly elevate HR. And the remainder of the interval needs to be hard enough to keep your HR at appropriately elevated level. But the hard start is not an all-out Sprint. If it was, people with high anaerobic capacity would destroy themselves in the first 10-20 seconds, and not be able to turn the pedals by 30 seconds. Ie Wingate test.
