Lol no it hasn't. As of last year, the state owned 83% of EDF, along with everything that being a publicly traded company entails. The renationalization process has been started, then immediately halted by shareholders that sued to block it. Additionally, things don't get magically fixed because it belongs to the state again. The current state of things is the result of 20 years of selling off EDF, piece by piece to vultures.

This is like watching a new administration take over government and then blaming them a month later for problems caused by the previous administrators. It takes time to fix years of neglect and malicious incompetence.