The dumbest bit...

You can tell he's not completely deaf because he's got a good speech pattern, if you're completely deaf there's not much chance you can speak as clearly as Nic does.

Original poster is saying he wouldn't be able to hear the radio because he's deaf, we're pointing out What Nic has already said, j.e the radio acted like a giant hearing aide and that he could hear Aston screaming, we're not saying he isn't deaf but that he is not 100% deaf and can make out some noise.
We're just going on what Nic has said.

Nobody is saying he is not deaf, clearly he is, but the OP is trying to argue that EVERYBODY who is born deaf will not be able to hear, even with aids (and is therefore questioning how he heard the radio). Anyone who paid attention in biology at school should know that this simply not true, even without Nic himself pointing it out.

It's pretty obvious from both watching Nic and from what he says that he can hear, to some degree using a hearing aid, he just chooses not to use one on a day to day basis. I can completely understand this- with a hearing level as low as Nic's, a hearing aid will only serve as a massive sensory overload- completely useless in everyday life- useful however if he needs to hear important, life or death info over a radio.

To be honest, I'm lost too. The OP asked a question then tries to argue it when it's answered by actually quoting Nic himself!

Also, when I use the words 'completely deaf', I'm going on the premise of the OP- ie that being born deaf cannot be corrected or helped with aids; I'm only using those words to make it clear what I am talking about. I don't know Nic, so he may well be 'completely deaf' without aids. My agrument is purely due to this claim, not Nic's case specifically.