Or, maybe GM found that after Ford and Stellantis dropped their midsize sedans, they had the market to themselves and could make a profit on the Malibu. Since they're going to have at least one more generation of the ICE Malibu(rumored to be followed by an EV Malibu), that's more likely than your scenario.
And that is the second time in this thread that you have stated that totally unsubstantiated speculation about the next Malibu coming from Korea, no doubt pulled from your nether regions.