Did they factor the jobs in intercountry shipping and export shipping as well?
Did they factor the fact that the jobs would have an internal multiplier effect?
Or that instead of say having 10 low skilled factory workers you may have 4 high skilled technitians who need 2 babysitters and other peripheral service jobs are created to support them, etc etc...
No job is an island.
That someone is employed will mean other people will have jobs. We have seen how someone becoming unemployed leads to the demise of other jobs, the reverse is true, with a sole exception: Government and the administration of the Great Government Teat. Between that and (often unnecessary) regulation of the productive, government has become a parasitic growth sector, even as the host withers.