Amazing finale. Upped the stakes on what made Kang Kang, as well. He's not just some guy who beat a couple of dudes off-screen as powerful as him, he has carefully cultivated a world where, functionally immortal, it took a god as powerful as him if not more powerful given the magic, willing to do what he would not, to "beat" him. And even then, he's not really been beaten, simply replaced by someone doing what he could do, but would not for the risk it brought.
It does retoroactively also make Quantumania even weaker though. And I'm saying that as someone who found that movie alright — though certainly not nearly a "great" MCU movie. Technology aside, you're telling me 616 Kang got outsmarted by Ant-Man? Like, Ant-Man is smart, but in the MCU he has certainly not been portrayed as nearly this smart. Or maybe they will pull him out of the probabilistic drive thing to start the Kang Dynasty and this was all planned and just poorly explained.
Jonathan Majors was great here. I really hope things work out with his case and it's proven he is innocent. He's such a good actor and commands the room when he speaks. His presence will be missed if he ends up having to exit the MCU.
Most people believe that line was indeed referring to Quantamania. And here’s hoping we see a better version of Kang the Conquerer later. They’ve found ways to write around things before like, The Mandarin.