yes he did, but according to Bubba Foley apologised for it immediately after saying he didn't mean to throw a potato
Still, we got this great foto from it.
Plus, it is well known Foley is not a fan of Bubba, so who knows.
Edit: I just looked at that week's Observer and although Meltzer describes Foley's punch as very stiff, in no way is he saying anything about it being on purpose. Atleast I didn't find anything.