It’s not all him, several other people invested in both. According to some article Elon owns 79% of X, and only 54% of xAI (barely enough to control it). Since the valuation of X in the deal is about $20 billion more what others have estimated ($12.3 billion), it definitely seems like it’s a corrupt bailout 46% funded with other xAI investors’ money, basically netting Elon $10 billion overnight.