It is either mislabeled or it is because after the first few intervals your anaerobic system becomes spent and the session becomes more aerobic the further along you go, which would lead to an emphasis on your peak aerobic uptake. So even though you are in the anaerobic zones you are really doing a lot of work at a high aerobic level, which I believe is the point of most micro burst sessions.
Also the fact that the recovery valleys aren’t full recoveries (40% ftp) but partial recoveries at what looks like 75-80% ftp will make the session more aerobic as opposed to anaerobic. That would be my explanation as to why it is listed as V02 as opposed to anaerobic, or I could be wrong and it is just mislabeled.