Do you have any idea what housing costs in the bay area though? We can compare between the zipcodes of Gigafactory Texas and Fremont. According to Redfin the median sale price for 78725 (Austin) is $362k, compared to $1.225 million for 94538 (Fremont). That's more than 3x the price. Compared to California it's definitely affordable.
Austin: https://www.redfin.com/zipcode/78725/housing-market
Fremont: https://www.redfin.com/zipcode/94538/housing-market