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Time only defines the state of the extremely complex system known as universe. It's an idea to make things more simple for us humans, not a physics phenomena. Stop all the particles and waves in the universe and time has no meaning. At least that's how I understand what he meant by this.

I think his point is that time is so inherently relative to the location / inertia of the observer that it is in practice a human construct.

The physicists definition of time is "What clocks measure". It sounds like he was just saying the party line.