Well yeah. All the smart singers do, it’s a tough song, better to get it right in the studio than screw it up in the big event. The generally considered best performance ever, Whitney at the Super Bowl, was synched.
Best ever was Lou Rawls. Tell me that was lip synched and ... well, I sure hope it wasn’t.
There’s a section on The Star Spangled Banner in the Lou Rawls Wiki article. They cite the Shavers-Ali fight at “The Garden” in 1977, and say he was requested to sing it “many times” after that. I’m thinking of an NFL game from the 80’s, I guess. I want to say Monday Night, but I don’t think so. Anyway, I thought “Wow!”, and sure enough the announcers expressed a similar opinion after he was done. “Ah yes, I remember it well!”