That impact comes through the multiplier effect. Each high-quality manufacturing job should generate about three other full-time jobs - retail, service, other trade, education and so forth. These are REAL, not hypothetical impacts. So the 6,500 direct Tesla-jobs should expand to something like 25,000 total jobs created in Nevada.
By the way, service industries....especially Nevada's gambling....have a minuscule multiplier effect. Casinos' ancillary jobs created are low-quality and relatively few. The state absolutely needed a keystone manufacturing opportunity like the one Tesla offered - it absolutely will have an demonstrable and large positive effect on Nevada's economy for decades.
Well done to all.