assuming its true, then, well... leopard has been around for quite a while and lots of people produced lots of leopard pieds and pied-looking super leopards, and only very recently did we hear about a single case where the genes seem to have become seperated.
so i guess it happens very rarely indeed. if one in 100, or 1 in 1000, or one in 10000 leopards turn out to NOT be het pied, i dont think that would be a problem at all.
the way to prove it is quite straightforward: produce the world first super leopard that is not a piebald and prove it out.
i think its cool if its real, because it means we would have two distinct lines: leopard het pied and leopard without het pied. and the super leopards that are not pied may also look different and open the door for new optics.