It seems like the Lakers are ready to move on from LeBron James. They didn’t offer him an extension or even give him a heads-up about the sale,
Are you sure? I thought that the contract he's signed last year includes this season.
In LeBron's current contract, the upcoming season is a player option.
It is worth noting that recently, there have indeed been a lot of rumors that LeBron may leave the Lakers. As far as I know, the Warriors are very interested in LeBron, and it seems like they are already making attempts to get him.