I heard on the news that 10,000 construction jobs would be created, so perhaps both are right - 10,000 temporary construction jobs, and 3,000 permanent/plant jobs.
Though you are right, this looks like an exceptionally misleading deal from the point of view of the taxpayer. When I think of Foxconn workers I dont think of the kinds of jobs I think we would want to heavily invest in, but I hope I am wrong.