Automation is generally done due to cost savings. So if you replace a thousand jobs, then you pay for automation less than you paid for these thousand jobs, so

Automation is generally done due to cost savings. So if you replace a thousand jobs, then you pay for automation less than you paid for these thousand jobs, so obviously there's less than thousand people involved in creating and maintaining and selling that automation. And if the automated jobs are low-paying jobs and the "automators" are mostly highly-paid engineers, then the gap is even larger. If there's an engineer paid $200k + overhead for working on automation, then that only can happen if his/her job alone results in automating away ten $30k jobs.