If all of the sudden it becomes possible to build a B2B company at 10x less cost which can save its customer, say, $1m per year and before this company cost $2m per year to run and now costs $200k, then it means before this was unviable and now it is viable — up to $800k profit a year now versus $1m loss per year before — then this increase in productivity has caused an increase in the number of available jobs.
Our economy would have collapsed a long time ago if an increase in productivity resulted in a decrease in employment.