Yeah, it's not like armour values matter and Bazookas have to fight against better armoured vehicles compared to PzSchrecks, especially the OKW ones. Surely this makes no difference.
The test was done against a PV. You can also see the performance of normal zook (red lines). As i said before, Rangers AT with
3 ZOOKs is the highest DPS output you can get out of any infantry AT, including Shrecks and including against targets with armor) but you are paying 50% more in munitions (150 vs 100) on a more expensive unit which means higher cost and reinforce.
Using only 2 super zook has an inferior performance compared to PF even if they pay the same munition and they are more expensive.