The metric in question might be "labour share of income" and it has indeed been decreasing for a long time.
But it's not obvious that incentives in individual jobs are affecting overall productivity (can one factory worker really make the conveyor belt move faster?). A plausible explanation could be that it's becoming easier (and profitable) to hire more low-wage workers than systematically increasing productivity.
My understanding is that cheap labor (China) is why there was nearly a complete stop of factory automation. Instead of increasing automation, low cost labor was utilized instead. Now that wages are rising around the globe, there should be increased innovation around automation. Explicitly that would be factory robots.
But it's not obvious that incentives in individual jobs are affecting overall productivity (can one factory worker really make the conveyor belt move faster?). A plausible explanation could be that it's becoming easier (and profitable) to hire more low-wage workers than systematically increasing productivity.