Well, the guy did it in real life is wrong. the armchair generals say so 
It was a complte waste of time, even though it apparently was a teached tactic when dealing with armor.. but thats ok, the AH model has it right, 50,000 rounds of 50 cal wont even scratch a tiger.. after all, what do the people who did it in real life know anyway... pfft, very little compared to our panel of video game experts. 
oh yea, from what ive read the tiger had 25mm of top armor, and 20mm of bottom armor... but dont let that get in the way of your assumptions.
Yes, the guys who thought they did it in real life were wrong. Or they were never able to do it themselves, but "knew" it could happen because of stories of others. Doesn't make them liars, if that is what you think we are calling them. It just makes them mistaken.
So please tell me how a .50cal round, after losing energy by striking a solid object, deflecting upward and striking more than 3/4 inch of steel at an oblique angle can penetrate said steel. That is
your assumption, so prove it out.
<Sidenote> After listening to the clip a few times, I am not even sure the "unarmored bottom of the tank" he is referring to is the Tiger, or the fuel tank he mentions were sometimes towed behind them.
Regardless, the true effectiveness of air interdiction against armored columns was not harming the tanks themselves, but destroying the unarmored fuel and ammo trucks that accompanied them. Deprive the thirsty monsters of fuel, they become nothing better than pillboxes.
