I suspect that's precisely why the computer can measure it. This is the scenario: 1. Player A makes a move the computer considers suboptimal. 2. Disoriented p

I suspect that's precisely why the computer can measure it. This is the scenario: 1. Player A makes a move the computer considers suboptimal. 2. Disoriented player B responds with another move the computer considers an important mistake. 3. Player A capitalizes with moves the computer thinks improves his position, even relative to the original baseline. 4. The computer concludes that A is nettlesome. So it's measuring the delta of what it considers optimal with what actually happens against real humans.