That is true. Either the US makes Puerto Rico a state or lets them run a referendum to become their own 'country' if they wish. At the moment, he is a US Citizen. What happens in 5 or 10 years is a different story if they become separate. They can choose if they pass a referendum, but that is a whole different can of political worms. They can't vote in US elections, but they do vote on their own local self government.
Also, pretty sure the Super Bowl has had quite a few non-Americans playing at the half time show in the past.
My understanding is that full independence and US statehood (like Hawaii) are the least two popular options right now. Independence: (no Medicare? no hurricane help? no freely flying back and forth). Statehood: (lose our unique Spanish language culture? - Bad Bunny himself would be a good example of that risk). Most Puerto Ricans like it just the way it is and has been, in other words “please let’s just do nothing. It’s actually very nice being citizens, and boy are the Mexicans jealous”. But of course that can change, and someone like him certainly will influence the younger generation.