I've never heard of that but i would assume that should you put your seeds in a hot pan you would destroy the embryo. Just stick with the float test.
Mind you the float test does only work for certain species of plants ( MJ being one of them), for anyone just interested in growing basically any plant, keep in mind that some plants use floating seeds as a method of dispersal while others simply have less dense or dry coats allowing them to float all the while being viable seeds.
But I digress...Float test good Hot pan Bad...