I think his point is that the real world is concurrent states, not context switching. To loosely paraphrase Joe Armstrong, in the real world, data isnt shared, it's communicated. In this sense, the process as a fundamental abstraction more correctly models "the real world."
To me that's as bad as saying "everything is an object".
I'd rather try and understand where each approach is best rather than picking a single approach and dogmatically applying it in every scenario.