I'm someone who tries to avoid AI tools. But this paper is literally basing its whole assessment off of two things; wages and hours. This is a disingenuous assertion.
Lets assume that I work 8 hours per day. If I am able to automate 1h of my day with AI, does that mean I get to go home 1 hour early? No. Does that mean I get an extra hour of pay? No.
So the assertion that there has been no economic impact assumes that the AI is a separate agent that would normally be paid in wages for time. That is not the case.
The AI is an augmentation for an existing human agent. It has the potential to increase the efficiency of a human agent by n%. So we need to be measuring the impact that is has on effectiveness and efficiency. It will never offset wages or hours. It will just increase the productivity for a given wage or number of hours.