Folks are jumping to conclusions and need to let the song cook.
I'll keep this simple because I see too much handwringing and nervous comments for my liking. Celebration sounds great live, its getting excellent reception as a live song, the Fimmies are being praised for their performance of it, and as far as I'm concerned they already won. Celebration isn't a complicated song. It's meant as a fun summer banger and it fulfills that task. Forget metrics or whatever reddit comments you see nitpicking the song. Study the comment history of a lot of the folks who do that nitpicking and you'll quickly realize several of them have jaded perspectives or are influenced by in-group tribalism. Take a deep breath, wait a while, let LSF rock the song with live performances, and just enjoy yourselves. It's a good song, it really is. It's a lot of fun and I can't wait to see the remixes and live performances from it.