This article reports it. I used google translate. Says it was a helicopter, the yacht skipper in turn has posted a photo of the aircraft which is NOT a helicopter. All on the page.
If you right click on the images you can "Open in new tab". This gets you a higher resolution image which you can click on to zoom in.
https://actu.fr/pays-de-la-loire/les..._38522755.html
More here-