Sparklefizz
It was an American friend of mine who expressed surprise that in the UK we didn't think we had any suitable singers. She pointed out that in the US they don't have a British singer at the Super Bowl, for instance.
We could have had Ed Sheeran, Adele, Ellie Goulding, Jack Savoretti, Elton John to name just a few, even Tom Jones and Shirley Bassey whose voices have held up.
2002 was U2 (Irish) - a tribute to the victims of 9/11
2003 was Shania Twain (Canadian)
2005 was The Rolling Stones (UK)
2006 was Paul McCartney (UK)
2010 was The Who (UK)
2016 was coldplay (UK)
2020 had shakira (Colombian)
2021 had The Weeknd (Canadian)
So, your friend is wrong.
Also, did you know those performers all pay to play at the Super Bowl?