[alex-]

> "...can make as many shirts per hour as about 17 humans"

Surprised they are looking at it per hour. Presumably the automation could run for close to 24 hours a day, whereas the human workforce could not.

So each of these units could replace 51 workers? (3 rotations of 17 workers each doing 8 hours a day). That's before considering the human workforce generally requires 2 days a week off.