What is 'real hourly compensation'?
It's economic jargon for what people are paid per hour for working (which can include non-direct payments such as healthcare and pensions), adjusted for inflation (for economists, "real" just means divided by CPI, as opposed to "nominal" which are the actual dollar amounts in the past).
Data is collected through the National Compensation Survey: https://www.bls.gov/respondents/ncs/
The normal conversation is that productivity growth has slowed and the divide has increased, not that more productivity creates lower outcomes in real terms.
https://www.bls.gov/productivity/images/labor-compensation-l...