That video was way an outlier, in the sense that in this case the RNG was really in favor of the Rifle squads.
KT: 1280HP 375 frontal armor
Zook: 80dmg 130/110 pen
Pen to kill: 16
Avg ttk: 50 hits
On vid: 36 hits
We could make more vids, and on some cases it would take double the amount or some lucky guy would kill the KT on just 2 volleys.
The big difference between zook and shrecks is the burst damage. No one is gonna sit and eat constant damage from handheld AT. The most important thing comes from the damage from the first or 2nd volley.
Not that I disagree with the point you made, but your math is incorrect.
What you're not taking into account in your 50 hits average is deflection damage, which zooks do.
In reality, the average is closer to 34 when you take into account deflection damage. You can see it in the video if you look closely on the king tiger. I activated the health monitor, so you'll see little damage number pop up when the king tiger gets hit. please note that hits that occur at around the same time will be added together. So you'll see 20s pop up ( which is deflection damage ) or maybe a 100 which would be 1 hit and 1 deflection.
I re-rewatched the video and I counted 9 penetrating hits and 26 deflections, plus the final hit which didn't show a number because the tank died.
If you do the math 9 + 80 + 26 * 20 = 1240, so it didn't really matter what the last hit was I guess, even if it deflected it would have finished it off.
Now since they were at max range, 110/375 = 29.3%
now we do 9 pens/ (26 + 9 ) = 25.7% of the shots were penetrating. Minus the final hit which was inconclusive but didn't matter because even a single deflection would have finished it off. So in fact, this video's RNG favored the king tiger.
Let's say for the sake of argument, the final hit penetrated. That's 10/37 = 27% RNG still favored the king tiger.
But all your other points I agree with.