From the same article:"...median estimates are derived for ECS of 1.64 K and for TCR of 1.33 K."
You're quoting equilibrium climate sensitivity (ECS); I'm not sure we'll ever see ECS. We will see a transient climate response (TCR) in a hundred years or so. That's 1.3 K - about 1 K.
The gentleman's question was about whether we can safely move forward with fossil fuel consumption. The answer is yes; the effect is small and we have no choice.