From Trump's speeches, he says that the US states was on the brink of collapse when Biden was President and now he saved it.
He's posting this tweet because he thinks that he has depicated himself as the gigachad meme and that Xi is the soyjak meme. Trump thinks that he has made China submit to him. As far as I can tell, Xi only said that 100k US students can study in China over the next 5 years and 2 pandas are being sent to Atlanta. Trump has said that he's against communism being taught in schools, but now US students being sent to schools in Communist China is a win to him? Trump has no leverage.