Yeah, that's not Occam's Razor. Occam's Razor has nothing to do with probability, only simplicity. Paraphrased, it's not "the most likely explanation is the correct one", but "the simplest explanation is the correct one". And the simplest answer is that the explanation given by Jobs is the right one. If you start adding in assumptions to decide that it is false, you're most definitely not using Occam's Razor.
And you still haven't said what's improbable about Jobs' explanation and what the more probable explanation is.
And you still haven't said what's improbable about Jobs' explanation and what the more probable explanation is.