Foo Fighters no longer play back-to-back shows in the same city, so it's very unlikely they'd headline their own show in London then pop over to The Netherlands for a festival the next day.
That was the other possibility I considered - first sell out the weekday for Manchester / Glasgow before then putting the Saturday on sale. Whichever way it goes it's glaring in it's omission.
That Churnups account isn’t official - it’s just pushing the general consensus & rumours. Lest you forget it had Pulp & RHCP stuff on the feed but then deleted things when they don’t come to be.
They were going to do a secret set in 2020 for their 25th and they’d also agreed to headline that one day Equinox in 2021. As 2025 is their 30th anniversary (and Glastonbury’s 55th) I wouldn’t rule them out headlining that.