He's either confused or has trouble expressing himself. If human CO2 emissions stopped, atmospheric temperature would still go up for a while (perhaps decades)

He's either confused or has trouble expressing himself. If human CO2 emissions stopped, atmospheric temperature would still go up for a while (perhaps decades), because of thermal inertia - for instance, the oceans haven't fully warmed to equilibrium, so they currently have a cooling effect on the atmosphere. There could then be some further increase in atmospheric CO2 because warm water holds less CO2 than cold water. There could be other positive and negative feedbacks (eg, higher CO2 and warmer temperatures may increase plant growth, sequestering CO2.) It's very unlikely that any of these feedbacks are of the "runaway" variety, because if that's how the earth worked, it would have become uninhabitable long ago, since there have been various temperature shocks over the last billion years or so that haven't lead to this fate. (If there were really "runaway" feedbacks, it wouldn't even take a big shock - the tiniest change would be amplified and push the climate into either extreme heat or cold.)