Dunno if this has been mentioned, but it seems the denial from Lyon is just cos they're publicly traded, so they need to carefully manage announcements.
On the Price of Football podcast recently they were saying the reason that all Man United signings are always described as "agreed in principle" is cos they have to make formal announcements to the NYSE.
Sounds like a similar situation with Lyon who aren't enjoying all the wild CONFIRMED shit on twitter. So I think everything is probs fine.