I was gonna comment “Isn’t it a little bit late for 2025 as they should have already started designing the new chassis by now?” then I read this

While a change of engine for next season would trigger some extra effort for Alpine in sorting out new installation for its 2025 car that is already being worked on, a switch to Mercedes would bring a likely immediate competitive boost because it is widely accepted that the current Renault power unit is down on power compared to the opposition.