Even then, it's not telling the whole story without knowing the cost per worker and the value per unit. When you take costs into account, you can get a situation where lowering production will increase earnings.
Taking your numbers and plugging in some values like 75 per worker and 0.01 per unit would increase earnings by 250%.
It it's an immediate decrease in output but they are planning on moving from 60 robots to 1000 robots in 2 years. so the 2 year expected capacity is 21,000,000 with a 5% defect rate vs. the 5,200,000 units with a 25% defect rate and wages/benefits for all those people.
Old: 650 workers * 8000pieces per person per month
New: 60 workers * 21000 pieces per person per month
It's a bit ambiguous but it makes it sound like total production output has dropped fourfold.