http://tankarchives.blogspot.ca/2013/03/battle-of-raseiniai.html
"Another seven shots hit the Soviet tank. It seemed that it was over. However, several minutes later, the [KV] tank started turning its turret. It is necessary to point out that after being hit, the noise inside the tank is deafening. Even machine gun fire sounds like the tank is being hammered with a mallet. After artillery fire, the crew's eardrums burst, blood flows from the ears, nose, eyes, people lose consciousness. Recall, that the tank was boiling inside during the summer. The tankers were not able to open fire straight away."
Having tanks that when shot at render crew members dazed seems like bad design overall, but I do understand Russia was quickly pushing forward designs for the war. It's also rather difficult to protect oneself from artillery strikes I imagine.
What simply is the historical validity of this claim/fact?
This is possible. It is called Noise-Induced Hearing Loss. In war, this is terribly common. The ear drum bursting and bleeding is possible, especially in a tank where the noise of a bounced shell would be amplified inside the tank. I don't want to imagine what that echo would sound like.
It also might not be resonation that caused that. Those injuries could easily be from a pressure wave that came from the blast. Those symptoms are common with blast injuries.
I know for the German crews, getting hit by a KV2 with its 152mm gun would often kill the crew without even penetrating just due to the sheer shockwave.