Local labor is often not used to build them. Most of these companies have crews they bring in during build out. Plus the actual setup of the facility is highly skilled: everyone is imported. The only local jobs we're talking about would be things like security, cleaning, and maybe some site prep work. The actual technical staff will not be hired locally in the majority of cases.

The argument here tho is the amount of jobs provided does not do a good enough job counteracting the downsides (noise, ground water pollution, generator air pollution, grid load and offset costs to customers, etc). In most cases these far outweigh <50 jobs if you look at overall cost/benefits.