That's simply not true. If my memory serves me right the stug has 140 armour, meaning even at point blank the t34 can bounce it 15% of the time and at max range the t34 only has 80 pen which translates to only a 57% chance to pen.
Ah, but you see, you forgot the part where we on the balance team have been trying to destroy his favorite faction for years. Its a simple fact you forgot to consider in your number calculations.