Cocococo, like many others is probably going off the reporting from BOF, of course they just are their internal sources and Miss Tweed who first reported it. Vogue Business also reported that Michael Rider may be going to Celine. It is fair to question the motives from these outlets as there are no official statements from the brand. But considering Vogue Business and BOF supposedly reputable outlets have reported he is leaving, wouldn't Celine/LVMH by now release a statement to debunk it?
The fact that there are instagram stories of Hedi's inner circle filming in St Tropez does not confirm he is still at Celine. Maybe he's somewhere else, maybe he's doing his own thing, maybe its a music video. Who the hell knows.