Coordinates: 50°27’07,38" N 1°38’34,17" E
Slightly east of Le Bout De Haut
Also this a bit further south
I think you’re right about the area
This page (google translated) suggests they are either mown fields, duck hunting areas, or areas disrupted and monitored for the effect on bees
Interestingly, I think the second photo from the carousel on your link shows one of these areas