As I understand, initially, the power production was done on-site using gas turbines. Later, these were moved to Mississippi and a high voltage powerline connected the two sites. After this change, why is the Memphis data center not clean and ecofriendly for residents of Memphis?
You moved the goalpost. You said they are clean as could be. While temporary, sure, it was a horrific situation for the nearby residents.
Later is just as likely to never happen, as happen. Billionaires have promised all sorts of things to get tax breaks for the things they want and never followed through with the parts that benefited others.
Anything can be done so rushed and shitty that it has negative consequences.