Tim Worstall sometimes gets sloppy when he wants to score points.
No individual runs the economy. No individual can. No bureaucracy, no centralized point can run the economy. The best we can hope for is that a Chancellor doesn’t screw it up.
Whoever is Chancellor makes decisions that have a huge impact on the economy. Some of them good (eg the change in monetary policy in 1997) some of them bad (eg the Lawson Budget of 1988).
Saying that the Chancellor does not "run" the economy because "no centralized point can" is like saying that Sven Goran Eriksson does not "run" the England football team because he cannot control every pass, tackle and shot.
We want more than a Chancellor that does not screw it up. Good economic policy-makers also make decisions to improve the functioning of the market economy. We need a Chancellor who adjusts taxation in the light of new evidence (such as raising tax on environmental taxes), and who responds to problems that would persist without action (eg raising benefits to lift children out of poverty).
Of course, knowing when not to do anything is an important talent too.