Mm, don't have access to statistics but feels completely wrong.
I know hoe-using African cultures that are jaw-droppingly sexist, mysoginistic and systematically abusive of women (for example in ownership of land, moveable goods, chidren and rights over the body). While I know ploughing cultures in Asia which are underlyingly matriarchal, where women have vastly better rights and quality of life.
What's more, human-powered ploughs are a very, very limited part of plough use. Most ploughs through history and across the world use draft animals (or now machines). I'm not at all convinced you'd need more strength to cultivate the same area by animal-drawn plough than by hoe (which requires both arm-strength and back strength).
I strongly suspect this is about ploughs as high-status equipment, and therefore ownership and use is a male thing, ditto ownership or use of draft-animals (just like man gets the family car, even tho he leaves it in station car park all day). There's a problem even now with installing village pumps in Africa, that a piece of mechanical engineering is automatically assumed to be "men's business". Since water-collection is typically "women's business", when the pump breaks the men cba to fix it - not their problem. So the best pump programmes include a female engineer teaching the women to strip and repair the pump.