I've never heard someone pronounce it that way in my life until I saw the video. Maybe it's a regional thing, but it sounds like the wrong vowel sound at the end to me.
Yes, I agree with that post that the USian pronunciation as given there is better than the British one. But Jobs' rendering of the American pronunciation also sounds wrong to me because the final syllable doesn't generally rhyme with 'wire' as I've heard most Americans pronounce the word.
It may be regional. Jobs grew up in Mountain View and I grew up in Santa Clara, just a few miles down the road. My parents and teachers always said something resembling "jag-wire" in pronunciation.
That makes sense to me. Ahr/ire is a pair that gets swapped or blended in other American accents as well, after all! Many Southern accents basically do the same kind of blending but in the other direction.
It may be regional, but I was born and raised in Silicon Valley / SF South Bay, like Steve Jobs, and my parents and teachers all said "jagwire." I don't pronounce it that way myself anymore, but that's because if I say it I'm often talking about the car brand, and I know the brits pronounce it differently so I do the same.
Do some google search for "jagwire" and you'll find tons of results about Americans pronouncing it that way.
EDIT: The word comes from a Native American language via Portuguese. I'm not sure about the indigenous phonetics, but the Portuguese pronunciation is closer to "jagwire" than the British pronunciation.
