Let’s see if the people of Memphis complain about the jobs the facility creates
How many jobs do you think a supercomputing facility brings? It's mostly hardware that runs itself, we're not talking about thousands of assembly-line workers. A similar project in Atlanta only created 50 construction/installation jobs and 24 decent permanent jobs. And it's unlikely those jobs will even be hired from Memphis itself. And for that, the city is giving him a $10 million tax break.
The vast majority of Musk's spending will be on the tech and infrastructure. For the most part, the supercomputer will be automated and those working with it probably won't even have to go on-site.
On top of that, the facility is going to use an enormous amount of electricity and water, which will inevitably lead to shortages for everyone else. He's probably already negotiated a sweetheart deal on power and water prices too.