Why, what makes you think there’s any connection? Molecule handedness doesn’t affect animal handedness, they are completely independent things with completely independent mechanisms, and the materials in between animal and molecule (shell, bone, skin, nerves, vasculature, etc.) don’t have any known handedness. We already know that not everything has that problem.
I think they just see asymmetry as a parent of handednes. Bones and skin and so are not symmetric, as probably anything in the universe (but some specific molecules, atoms and crystals?)
It goes deeper than that. Fundamental forces have chirality. This was a little controversial when first discovered.