Brummbär has low veterancy requirements and gets to vet 2 in no time.
Brumabr has an XP value of 2040 and does not even have low veterancy requirements as you claim, since they are inline with other units of similar cost like the Churchill at 2080 XP value.
Brumabr need 4080 XP to reach vet 2 which would mean around 51 conscripts to reach vet 2, I guess you are entitled to believe that a brumbar can kill 51 conscripts in no time (although I am not sure what mode you talking about).
Then it has 340 armor while being non-doc costing 150 fuel and having better mobility than KV2 that costs 230 fuel and is tied to only 2 doctrines. KV2 in revamp mod is easy to kill because once it´s snared it´s so slow that it can´t get away from anything + it gets penned by Pak40s with super high %.
One has to tech to T4 to get brumbar and has to spend allot of fuel to do so. KV-2 has no tech cost.
Try to snare a KV-2 and see how long your infantry will last or how many faust you need to get an engine damage.
The chance to penetrate a KV-2 with a pack at max range is 63% but I guess in your are entitled to believe that 63% is Super high. Even then a pak need 7 penetrating shot to kill a KV-2 but again I guess you have the right to call that easy.
For a thread you described as "complete madness" you do seem to post allot in it.
(I have responded to you original post but since then you have edited it)