Another way to look at it, is that your productivity equals your salary, i.e., marginal value added per unit of factor input. You work the same number of hours or years. You receive the same money. So your productivity is the same.

For the employer, the productivity of their capital investment has increased.

You might be able to increase your productivity if you can leverage a salary increase, or figure out how to sell the automation to your employer for more than your salary, or sell it to others.