Because they did a sold out arena tour almost double the size of their previous one and put on an all-timer Download headline set to a properly packed out field. That’s it.
This may be changed soon, but on webpage she is listed higher as Fontaines, that would suggest they aren't headlining. Or both are headliners, but that would be weak af
Pre festival this year I cycled round the whole site, effectively access all areas. Including standing on the Pyramid. As for meeting a “celebrity” I’ve had conversations with: Thom Yorke, Bez and Don Letts, maybe others I can’t recall