I didn't read it as belligerent. He stuck to facts only and avoided emotional vocabulary.
He simply stated the truth: "Steve didn't ever code."
It's not a judgement. He didn't say it made him inferior in any way. In fact, he praised him in the very next sentence saying "he was technical enough to alter and change and add to other designs".
I'm not sure any of this is a big revelation anyway...didn't we all pretty much know that Woz was the tech/programming guy and Jobs was the marketing/sales/business deal guy? They were amazingly successful together and it is doubtful that either one of them would have attained the same success if they had gone about it independently.