I always thought you had to ‘orbit’ around a point of mass. L2 is just a point in space. Where is the gravitational pull for Web to orbit around? What keeps it from just flying off?
L2 is the invisible point in space where the gravitational pull from the Earth, Moon, and Sun all balance out.
It has to station-keep to keep from flying off, L2 is only relatively-stable. However, it’s close enough to stable that it can station-keep with very little fuel. Moving in an orbit around the L2 point apparently makes it even easier to station-keep.
Maybe they put Webb Hubbell on board to add some extra weight.
;-)